diff --git a/.changeset/early-comics-shout.md b/.changeset/early-comics-shout.md
new file mode 100644
index 00000000000..59090fad718
--- /dev/null
+++ b/.changeset/early-comics-shout.md
@@ -0,0 +1,7 @@
+---
+"@effect/platform": minor
+"effect": minor
+"@effect/schema": minor
+---
+
+add deno support to Inspectable
diff --git a/packages/effect/src/BigDecimal.ts b/packages/effect/src/BigDecimal.ts
index 360dd6de230..29ecd5e3f1e 100644
--- a/packages/effect/src/BigDecimal.ts
+++ b/packages/effect/src/BigDecimal.ts
@@ -18,7 +18,7 @@ import * as Equal from "./Equal.js"
 import * as equivalence from "./Equivalence.js"
 import { dual, pipe } from "./Function.js"
 import * as Hash from "./Hash.js"
-import { type Inspectable, NodeInspectSymbol } from "./Inspectable.js"
+import { DenoInspectSymbol, type Inspectable, NodeInspectSymbol } from "./Inspectable.js"
 import * as Option from "./Option.js"
 import * as order from "./Order.js"
 import type { Ordering } from "./Ordering.js"
@@ -74,6 +74,9 @@ const BigDecimalProto: Omit<BigDecimal, "value" | "scale" | "normalized"> = {
       scale: this.scale
     }
   },
+  [DenoInspectSymbol](this: BigDecimal) {
+    return this.toJSON()
+  },
   [NodeInspectSymbol](this: BigDecimal) {
     return this.toJSON()
   },
diff --git a/packages/effect/src/Chunk.ts b/packages/effect/src/Chunk.ts
index ab7ddffab32..8d8c62dd8c6 100644
--- a/packages/effect/src/Chunk.ts
+++ b/packages/effect/src/Chunk.ts
@@ -9,7 +9,7 @@ import * as Equivalence from "./Equivalence.js"
 import { dual, identity, pipe } from "./Function.js"
 import * as Hash from "./Hash.js"
 import type { TypeLambda } from "./HKT.js"
-import { format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
+import { DenoInspectSymbol, format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
 import type { NonEmptyIterable } from "./NonEmptyIterable.js"
 import type { Option } from "./Option.js"
 import * as O from "./Option.js"
@@ -135,6 +135,9 @@ const ChunkProto: Omit<Chunk<unknown>, "backing" | "depth" | "left" | "length" |
       values: toReadonlyArray(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]<A>(this: Chunk<A>) {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]<A>(this: Chunk<A>) {
     return this.toJSON()
   },
diff --git a/packages/effect/src/Cron.ts b/packages/effect/src/Cron.ts
index 856d6c0b443..7a75721896f 100644
--- a/packages/effect/src/Cron.ts
+++ b/packages/effect/src/Cron.ts
@@ -7,7 +7,7 @@ import * as Equal from "./Equal.js"
 import * as equivalence from "./Equivalence.js"
 import { dual, pipe } from "./Function.js"
 import * as Hash from "./Hash.js"
-import { format, type Inspectable, NodeInspectSymbol } from "./Inspectable.js"
+import { DenoInspectSymbol, format, type Inspectable, NodeInspectSymbol } from "./Inspectable.js"
 import * as N from "./Number.js"
 import { type Pipeable, pipeArguments } from "./Pipeable.js"
 import { hasProperty } from "./Predicate.js"
@@ -67,6 +67,9 @@ const CronProto: Omit<Cron, "minutes" | "hours" | "days" | "months" | "weekdays"
       weekdays: Arr.fromIterable(this.weekdays)
     }
   },
+  [DenoInspectSymbol](this: Cron) {
+    return this.toJSON()
+  },
   [NodeInspectSymbol](this: Cron) {
     return this.toJSON()
   },
diff --git a/packages/effect/src/DateTime.ts b/packages/effect/src/DateTime.ts
index fc8ff3e1d25..ee8c336e25f 100644
--- a/packages/effect/src/DateTime.ts
+++ b/packages/effect/src/DateTime.ts
@@ -230,6 +230,9 @@ const Proto = {
   pipe() {
     return pipeArguments(this, arguments)
   },
+  [Inspectable.DenoInspectSymbol](this: DateTime) {
+    return this.toString()
+  },
   [Inspectable.NodeInspectSymbol](this: DateTime) {
     return this.toString()
   },
@@ -273,6 +276,9 @@ const ProtoZoned = {
 
 const ProtoTimeZone = {
   [TimeZoneTypeId]: TimeZoneTypeId,
+  [Inspectable.DenoInspectSymbol](this: TimeZone) {
+    return this.toString()
+  },
   [Inspectable.NodeInspectSymbol](this: TimeZone) {
     return this.toString()
   }
diff --git a/packages/effect/src/Duration.ts b/packages/effect/src/Duration.ts
index 1af113a5b50..994fe843da5 100644
--- a/packages/effect/src/Duration.ts
+++ b/packages/effect/src/Duration.ts
@@ -6,7 +6,7 @@ import type * as equivalence from "./Equivalence.js"
 import { dual } from "./Function.js"
 import * as Hash from "./Hash.js"
 import type { Inspectable } from "./Inspectable.js"
-import { NodeInspectSymbol } from "./Inspectable.js"
+import { DenoInspectSymbol, NodeInspectSymbol } from "./Inspectable.js"
 import * as Option from "./Option.js"
 import * as order from "./Order.js"
 import type { Pipeable } from "./Pipeable.js"
@@ -160,6 +160,9 @@ const DurationProto: Omit<Duration, "value"> = {
         return { _id: "Duration", _tag: "Infinity" }
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/FiberHandle.ts b/packages/effect/src/FiberHandle.ts
index 4392172a82c..50c648a1775 100644
--- a/packages/effect/src/FiberHandle.ts
+++ b/packages/effect/src/FiberHandle.ts
@@ -64,6 +64,9 @@ const Proto = {
       state: this.state
     }
   },
+  [Inspectable.DenoInspectSymbol](this: FiberHandle) {
+    return this.toJSON()
+  },
   [Inspectable.NodeInspectSymbol](this: FiberHandle) {
     return this.toJSON()
   },
diff --git a/packages/effect/src/FiberMap.ts b/packages/effect/src/FiberMap.ts
index 57c0fff3732..4f9ba92e526 100644
--- a/packages/effect/src/FiberMap.ts
+++ b/packages/effect/src/FiberMap.ts
@@ -74,6 +74,9 @@ const Proto = {
       state: this.state
     }
   },
+  [Inspectable.DenoInspectSymbol](this: FiberMap<unknown>) {
+    return this.toJSON()
+  },
   [Inspectable.NodeInspectSymbol](this: FiberMap<unknown>) {
     return this.toJSON()
   },
diff --git a/packages/effect/src/FiberSet.ts b/packages/effect/src/FiberSet.ts
index 53e0a50a8cc..16e8de49d0c 100644
--- a/packages/effect/src/FiberSet.ts
+++ b/packages/effect/src/FiberSet.ts
@@ -72,6 +72,9 @@ const Proto = {
       state: this.state
     }
   },
+  [Inspectable.DenoInspectSymbol](this: FiberSet<unknown, unknown>) {
+    return this.toJSON()
+  },
   [Inspectable.NodeInspectSymbol](this: FiberSet<unknown, unknown>) {
     return this.toJSON()
   },
diff --git a/packages/effect/src/Inspectable.ts b/packages/effect/src/Inspectable.ts
index 95732771909..305432ef15a 100644
--- a/packages/effect/src/Inspectable.ts
+++ b/packages/effect/src/Inspectable.ts
@@ -16,6 +16,18 @@ export const NodeInspectSymbol = Symbol.for("nodejs.util.inspect.custom")
  */
 export type NodeInspectSymbol = typeof NodeInspectSymbol
 
+/**
+ * @since 3.9.0
+ * @category symbols
+ */
+export const DenoInspectSymbol = Symbol.for("Deno.customInspect")
+
+/**
+ * @since 3.9.0
+ * @category symbols
+ */
+export type DenoInspectSymbol = typeof DenoInspectSymbol
+
 /**
  * @since 2.0.0
  * @category models
@@ -24,6 +36,7 @@ export interface Inspectable {
   toString(): string
   toJSON(): unknown
   [NodeInspectSymbol](): unknown
+  [DenoInspectSymbol](): unknown
 }
 
 /**
@@ -56,6 +69,9 @@ export const BaseProto: Inspectable = {
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   toString() {
     return format(this.toJSON())
   }
@@ -75,6 +91,12 @@ export abstract class Class {
   [NodeInspectSymbol]() {
     return this.toJSON()
   }
+  /**
+   * @since 3.9.0
+   */
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  }
   /**
    * @since 2.0.0
    */
diff --git a/packages/effect/src/List.ts b/packages/effect/src/List.ts
index af65300bdb0..12d9bd78667 100644
--- a/packages/effect/src/List.ts
+++ b/packages/effect/src/List.ts
@@ -28,7 +28,7 @@ import * as Equal from "./Equal.js"
 import * as Equivalence from "./Equivalence.js"
 import { dual, identity, unsafeCoerce } from "./Function.js"
 import * as Hash from "./Hash.js"
-import { format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
+import { DenoInspectSymbol, format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
 import type { nonEmpty, NonEmptyIterable } from "./NonEmptyIterable.js"
 import * as Option from "./Option.js"
 import type { Pipeable } from "./Pipeable.js"
@@ -110,6 +110,9 @@ const ConsProto: Omit<Cons<unknown>, "head" | "tail" | typeof nonEmpty> = {
       values: toArray(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
@@ -176,6 +179,9 @@ const NilProto: Nil<unknown> = {
       _tag: "Nil"
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/Micro.ts b/packages/effect/src/Micro.ts
index 6cf83213b31..1a1c80f2865 100644
--- a/packages/effect/src/Micro.ts
+++ b/packages/effect/src/Micro.ts
@@ -13,7 +13,7 @@ import { constTrue, constVoid, dual, identity, type LazyArg } from "./Function.j
 import { globalValue } from "./GlobalValue.js"
 import type { TypeLambda } from "./HKT.js"
 import type { Inspectable } from "./Inspectable.js"
-import { NodeInspectSymbol, toStringUnknown } from "./Inspectable.js"
+import { DenoInspectSymbol, NodeInspectSymbol, toStringUnknown } from "./Inspectable.js"
 import * as doNotation from "./internal/doNotation.js"
 import { StructuralPrototype } from "./internal/effectable.js"
 import { SingleShotGen } from "./internal/singleShotGen.js"
@@ -323,6 +323,9 @@ abstract class MicroCauseImpl<Tag extends string, E> extends globalThis.Error im
   toString() {
     return this.stack
   }
+  [DenoInspectSymbol]() {
+    return this.stack
+  }
   [NodeInspectSymbol]() {
     return this.stack
   }
@@ -4097,6 +4100,9 @@ const YieldableError: new(message?: string) => YieldableError = (function() {
     toJSON() {
       return { ...this }
     }
+    [DenoInspectSymbol](): string {
+      return this[NodeInspectSymbol]()
+    }
     [NodeInspectSymbol](): string {
       const stack = this.stack
       if (stack) {
diff --git a/packages/effect/src/MutableHashMap.ts b/packages/effect/src/MutableHashMap.ts
index 1b5e0cabbba..8ab81caca95 100644
--- a/packages/effect/src/MutableHashMap.ts
+++ b/packages/effect/src/MutableHashMap.ts
@@ -5,7 +5,7 @@ import type { NonEmptyArray } from "./Array.js"
 import * as Equal from "./Equal.js"
 import { dual } from "./Function.js"
 import * as Hash from "./Hash.js"
-import { format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
+import { DenoInspectSymbol, format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
 import * as Option from "./Option.js"
 import type { Pipeable } from "./Pipeable.js"
 import { pipeArguments } from "./Pipeable.js"
@@ -46,6 +46,9 @@ const MutableHashMapProto: Omit<MutableHashMap<unknown, unknown>, "referential"
       values: Array.from(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/MutableHashSet.ts b/packages/effect/src/MutableHashSet.ts
index d61e72660d4..0f7b2d21bfe 100644
--- a/packages/effect/src/MutableHashSet.ts
+++ b/packages/effect/src/MutableHashSet.ts
@@ -2,7 +2,7 @@
  * @since 2.0.0
  */
 import * as Dual from "./Function.js"
-import { format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
+import { DenoInspectSymbol, format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
 import * as MutableHashMap from "./MutableHashMap.js"
 import type { Pipeable } from "./Pipeable.js"
 import { pipeArguments } from "./Pipeable.js"
@@ -40,6 +40,9 @@ const MutableHashSetProto: Omit<MutableHashSet<unknown>, "keyMap"> = {
       values: Array.from(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/MutableList.ts b/packages/effect/src/MutableList.ts
index 1027aaaa5c6..2c5e6d46e68 100644
--- a/packages/effect/src/MutableList.ts
+++ b/packages/effect/src/MutableList.ts
@@ -2,7 +2,7 @@
  * @since 2.0.0
  */
 import * as Dual from "./Function.js"
-import { format, NodeInspectSymbol, toJSON } from "./Inspectable.js"
+import { DenoInspectSymbol, format, NodeInspectSymbol, toJSON } from "./Inspectable.js"
 import type { Inspectable } from "./Inspectable.js"
 import type { Pipeable } from "./Pipeable.js"
 import { pipeArguments } from "./Pipeable.js"
@@ -63,6 +63,9 @@ const MutableListProto: Omit<MutableList<unknown>, "head" | "tail"> = {
       values: Array.from(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/MutableQueue.ts b/packages/effect/src/MutableQueue.ts
index bbd2326566e..5301e707af9 100644
--- a/packages/effect/src/MutableQueue.ts
+++ b/packages/effect/src/MutableQueue.ts
@@ -3,7 +3,7 @@
  */
 import * as Chunk from "./Chunk.js"
 import * as Dual from "./Function.js"
-import { format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
+import { DenoInspectSymbol, format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
 import * as MutableList from "./MutableList.js"
 import type { Pipeable } from "./Pipeable.js"
 import { pipeArguments } from "./Pipeable.js"
@@ -59,6 +59,9 @@ const MutableQueueProto: Omit<MutableQueue<unknown>, "queue" | "capacity"> = {
       values: Array.from(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/MutableRef.ts b/packages/effect/src/MutableRef.ts
index 0a2949eab5f..c4088f7bb4a 100644
--- a/packages/effect/src/MutableRef.ts
+++ b/packages/effect/src/MutableRef.ts
@@ -3,7 +3,7 @@
  */
 import * as Equal from "./Equal.js"
 import * as Dual from "./Function.js"
-import { format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
+import { DenoInspectSymbol, format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
 import type { Pipeable } from "./Pipeable.js"
 import { pipeArguments } from "./Pipeable.js"
 
@@ -37,6 +37,9 @@ const MutableRefProto: Omit<MutableRef<unknown>, "current"> = {
       current: toJSON(this.current)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/SortedMap.ts b/packages/effect/src/SortedMap.ts
index 61d23cbf85c..0d0e4aa1ebd 100644
--- a/packages/effect/src/SortedMap.ts
+++ b/packages/effect/src/SortedMap.ts
@@ -5,7 +5,7 @@ import * as Equal from "./Equal.js"
 import * as Dual from "./Function.js"
 import { pipe } from "./Function.js"
 import * as Hash from "./Hash.js"
-import { format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
+import { DenoInspectSymbol, format, type Inspectable, NodeInspectSymbol, toJSON } from "./Inspectable.js"
 import * as Option from "./Option.js"
 import type { Order } from "./Order.js"
 import type { Pipeable } from "./Pipeable.js"
@@ -62,6 +62,9 @@ const SortedMapProto: Omit<SortedMap<unknown, unknown>, "tree"> = {
       values: Array.from(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/SortedSet.ts b/packages/effect/src/SortedSet.ts
index 2bc50e544ba..721f1bf563e 100644
--- a/packages/effect/src/SortedSet.ts
+++ b/packages/effect/src/SortedSet.ts
@@ -7,7 +7,7 @@ import * as Dual from "./Function.js"
 import { pipe } from "./Function.js"
 import * as Hash from "./Hash.js"
 import type { Inspectable } from "./Inspectable.js"
-import { format, NodeInspectSymbol, toJSON } from "./Inspectable.js"
+import { DenoInspectSymbol, format, NodeInspectSymbol, toJSON } from "./Inspectable.js"
 import type { Order } from "./Order.js"
 import type { Pipeable } from "./Pipeable.js"
 import { pipeArguments } from "./Pipeable.js"
@@ -62,6 +62,9 @@ const SortedSetProto: Omit<SortedSet<unknown>, "keyTree"> = {
       values: Array.from(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/internal/cause.ts b/packages/effect/src/internal/cause.ts
index bb705011d40..fef9126ffcd 100644
--- a/packages/effect/src/internal/cause.ts
+++ b/packages/effect/src/internal/cause.ts
@@ -8,7 +8,7 @@ import { constFalse, constTrue, dual, identity, pipe } from "../Function.js"
 import { globalValue } from "../GlobalValue.js"
 import * as Hash from "../Hash.js"
 import * as HashSet from "../HashSet.js"
-import { NodeInspectSymbol, toJSON } from "../Inspectable.js"
+import { DenoInspectSymbol, NodeInspectSymbol, toJSON } from "../Inspectable.js"
 import * as Option from "../Option.js"
 import { pipeArguments } from "../Pipeable.js"
 import type { Predicate, Refinement } from "../Predicate.js"
@@ -69,6 +69,9 @@ const proto = {
   toString<E>(this: Cause.Cause<E>) {
     return pretty(this)
   },
+  [DenoInspectSymbol]<E>(this: Cause.Cause<E>) {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]<E>(this: Cause.Cause<E>) {
     return this.toJSON()
   }
diff --git a/packages/effect/src/internal/context.ts b/packages/effect/src/internal/context.ts
index 1fe348d8a58..b3bb12a7f5c 100644
--- a/packages/effect/src/internal/context.ts
+++ b/packages/effect/src/internal/context.ts
@@ -3,7 +3,7 @@ import * as Equal from "../Equal.js"
 import type { LazyArg } from "../Function.js"
 import { dual } from "../Function.js"
 import * as Hash from "../Hash.js"
-import { format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
+import { DenoInspectSymbol, format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
 import type * as O from "../Option.js"
 import { pipeArguments } from "../Pipeable.js"
 import { hasProperty } from "../Predicate.js"
@@ -42,6 +42,9 @@ export const TagProto: any = {
       stack: this.stack
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
@@ -126,6 +129,9 @@ export const ContextProto: Omit<C.Context<unknown>, "unsafeMap"> = {
       services: Array.from(this.unsafeMap).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return (this as any).toJSON()
+  },
   [NodeInspectSymbol]() {
     return (this as any).toJSON()
   }
diff --git a/packages/effect/src/internal/core.ts b/packages/effect/src/internal/core.ts
index 4cb2e9bf4d0..110d3c8a9c0 100644
--- a/packages/effect/src/internal/core.ts
+++ b/packages/effect/src/internal/core.ts
@@ -21,7 +21,7 @@ import { globalValue } from "../GlobalValue.js"
 import * as Hash from "../Hash.js"
 import * as HashMap from "../HashMap.js"
 import type * as HashSet from "../HashSet.js"
-import { format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
+import { DenoInspectSymbol, format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
 import * as List from "../List.js"
 import type * as LogLevel from "../LogLevel.js"
 import type * as LogSpan from "../LogSpan.js"
@@ -177,6 +177,9 @@ class EffectPrimitive {
   toString() {
     return format(this.toJSON())
   }
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  }
   [NodeInspectSymbol]() {
     return this.toJSON()
   }
@@ -226,6 +229,9 @@ class EffectPrimitiveFailure {
   toString() {
     return format(this.toJSON())
   }
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  }
   [NodeInspectSymbol]() {
     return this.toJSON()
   }
@@ -275,6 +281,9 @@ class EffectPrimitiveSuccess {
   toString() {
     return format(this.toJSON())
   }
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  }
   [NodeInspectSymbol]() {
     return this.toJSON()
   }
@@ -2194,6 +2203,9 @@ export const YieldableError: new(message?: string, options?: ErrorOptions) => Ca
     toJSON() {
       return { ...this }
     }
+    [DenoInspectSymbol]() {
+      return this[NodeInspectSymbol]()
+    }
     [NodeInspectSymbol]() {
       if (this.toString !== globalThis.Error.prototype.toString) {
         return this.stack ? `${this.toString()}\n${this.stack.split("\n").slice(1).join("\n")}` : this.toString()
diff --git a/packages/effect/src/internal/fiberId.ts b/packages/effect/src/internal/fiberId.ts
index c2f16666678..11138ec3879 100644
--- a/packages/effect/src/internal/fiberId.ts
+++ b/packages/effect/src/internal/fiberId.ts
@@ -4,7 +4,7 @@ import { dual, pipe } from "../Function.js"
 import { globalValue } from "../GlobalValue.js"
 import * as Hash from "../Hash.js"
 import * as HashSet from "../HashSet.js"
-import { format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
+import { DenoInspectSymbol, format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
 import * as MutableRef from "../MutableRef.js"
 import * as Option from "../Option.js"
 import { hasProperty } from "../Predicate.js"
@@ -58,6 +58,9 @@ class None implements FiberId.None {
       _tag: this._tag
     }
   }
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  }
   [NodeInspectSymbol]() {
     return this.toJSON()
   }
@@ -91,6 +94,9 @@ class Runtime implements FiberId.Runtime {
       startTimeMillis: this.startTimeMillis
     }
   }
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  }
   [NodeInspectSymbol]() {
     return this.toJSON()
   }
@@ -131,6 +137,9 @@ class Composite implements FiberId.Composite {
       right: toJSON(this.right)
     }
   }
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  }
   [NodeInspectSymbol]() {
     return this.toJSON()
   }
diff --git a/packages/effect/src/internal/hashMap.ts b/packages/effect/src/internal/hashMap.ts
index f61e638da32..25393feae5c 100644
--- a/packages/effect/src/internal/hashMap.ts
+++ b/packages/effect/src/internal/hashMap.ts
@@ -3,7 +3,7 @@ import * as Dual from "../Function.js"
 import { identity, pipe } from "../Function.js"
 import * as Hash from "../Hash.js"
 import type * as HM from "../HashMap.js"
-import { format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
+import { DenoInspectSymbol, format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
 import * as Option from "../Option.js"
 import { pipeArguments } from "../Pipeable.js"
 import { hasProperty } from "../Predicate.js"
@@ -85,6 +85,9 @@ const HashMapProto: HM.HashMap<unknown, unknown> = {
       values: Array.from(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/internal/hashSet.ts b/packages/effect/src/internal/hashSet.ts
index a60b87d0758..65cb0885326 100644
--- a/packages/effect/src/internal/hashSet.ts
+++ b/packages/effect/src/internal/hashSet.ts
@@ -3,7 +3,7 @@ import { dual } from "../Function.js"
 import * as Hash from "../Hash.js"
 import type { HashMap } from "../HashMap.js"
 import type * as HS from "../HashSet.js"
-import { format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
+import { DenoInspectSymbol, format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
 import { pipeArguments } from "../Pipeable.js"
 import type { Predicate, Refinement } from "../Predicate.js"
 import { hasProperty } from "../Predicate.js"
@@ -49,6 +49,9 @@ const HashSetProto: Omit<HashSetImpl<unknown>, "_keyMap"> = {
       values: Array.from(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/internal/mailbox.ts b/packages/effect/src/internal/mailbox.ts
index 2fd91b25647..13514d5f975 100644
--- a/packages/effect/src/internal/mailbox.ts
+++ b/packages/effect/src/internal/mailbox.ts
@@ -287,6 +287,9 @@ class MailboxImpl<A, E> extends Effectable.Class<readonly [messages: Chunk.Chunk
   toString(): string {
     return Inspectable.format(this)
   }
+  [Inspectable.DenoInspectSymbol]() {
+    return Inspectable.format(this)
+  }
   [Inspectable.NodeInspectSymbol]() {
     return Inspectable.format(this)
   }
diff --git a/packages/effect/src/internal/option.ts b/packages/effect/src/internal/option.ts
index 7d97adee2cd..c32d2199f73 100644
--- a/packages/effect/src/internal/option.ts
+++ b/packages/effect/src/internal/option.ts
@@ -4,7 +4,7 @@
 
 import * as Equal from "../Equal.js"
 import * as Hash from "../Hash.js"
-import { format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
+import { DenoInspectSymbol, format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
 import type * as Option from "../Option.js"
 import { hasProperty } from "../Predicate.js"
 import { EffectPrototype } from "./effectable.js"
@@ -16,6 +16,9 @@ const CommonProto = {
   [TypeId]: {
     _A: (_: never) => _
   },
+  [DenoInspectSymbol]<A>(this: Option.Option<A>) {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]<A>(this: Option.Option<A>) {
     return this.toJSON()
   },
diff --git a/packages/effect/src/internal/redBlackTree.ts b/packages/effect/src/internal/redBlackTree.ts
index 9076ff9d3b6..c154be78163 100644
--- a/packages/effect/src/internal/redBlackTree.ts
+++ b/packages/effect/src/internal/redBlackTree.ts
@@ -2,7 +2,7 @@ import * as Chunk from "../Chunk.js"
 import * as Equal from "../Equal.js"
 import { dual, pipe } from "../Function.js"
 import * as Hash from "../Hash.js"
-import { format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
+import { DenoInspectSymbol, format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
 import * as Option from "../Option.js"
 import type * as Order from "../Order.js"
 import type * as Ordering from "../Ordering.js"
@@ -71,6 +71,9 @@ const RedBlackTreeProto: RBT.RedBlackTree<unknown, unknown> = {
       values: Array.from(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/effect/src/internal/runtime.ts b/packages/effect/src/internal/runtime.ts
index 45f6284e207..373ccd624da 100644
--- a/packages/effect/src/internal/runtime.ts
+++ b/packages/effect/src/internal/runtime.ts
@@ -195,6 +195,9 @@ class FiberFailureImpl extends Error implements Runtime.FiberFailure {
   toString(): string {
     return "(FiberFailure) " + (this.stack ?? this.message)
   }
+  [Inspectable.DenoInspectSymbol](): unknown {
+    return this.toString()
+  }
   [Inspectable.NodeInspectSymbol](): unknown {
     return this.toString()
   }
diff --git a/packages/effect/src/internal/trie.ts b/packages/effect/src/internal/trie.ts
index b6c3033ed67..8e64223f940 100644
--- a/packages/effect/src/internal/trie.ts
+++ b/packages/effect/src/internal/trie.ts
@@ -1,7 +1,7 @@
 import * as Equal from "../Equal.js"
 import { dual, identity, pipe } from "../Function.js"
 import * as Hash from "../Hash.js"
-import { format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
+import { DenoInspectSymbol, format, NodeInspectSymbol, toJSON } from "../Inspectable.js"
 import * as Option from "../Option.js"
 import type * as Ordering from "../Ordering.js"
 import { pipeArguments } from "../Pipeable.js"
@@ -60,6 +60,9 @@ const TrieProto: TR.Trie<unknown> = {
       values: Array.from(this).map(toJSON)
     }
   },
+  [DenoInspectSymbol]() {
+    return this.toJSON()
+  },
   [NodeInspectSymbol]() {
     return this.toJSON()
   },
diff --git a/packages/platform/src/internal/httpBody.ts b/packages/platform/src/internal/httpBody.ts
index 4f43140a2aa..2530a104002 100644
--- a/packages/platform/src/internal/httpBody.ts
+++ b/packages/platform/src/internal/httpBody.ts
@@ -33,6 +33,9 @@ abstract class BodyBase implements Body.HttpBody.Proto {
     this[TypeId] = TypeId
   }
   abstract toJSON(): unknown
+  [Inspectable.DenoInspectSymbol](): unknown {
+    return this.toJSON()
+  }
   [Inspectable.NodeInspectSymbol](): unknown {
     return this.toJSON()
   }
diff --git a/packages/platform/src/internal/httpMultiplex.ts b/packages/platform/src/internal/httpMultiplex.ts
index 3c082766a99..5af3743b38a 100644
--- a/packages/platform/src/internal/httpMultiplex.ts
+++ b/packages/platform/src/internal/httpMultiplex.ts
@@ -52,6 +52,9 @@ class MultiplexImpl<E = never, R = never> extends Effectable.Class<
     return this.execute
   }
 
+  [Inspectable.DenoInspectSymbol]() {
+    return Inspectable.toJSON(this)
+  }
   [Inspectable.NodeInspectSymbol]() {
     return Inspectable.toJSON(this)
   }
diff --git a/packages/platform/src/internal/httpRouter.ts b/packages/platform/src/internal/httpRouter.ts
index dd8954bb329..3dc1634380b 100644
--- a/packages/platform/src/internal/httpRouter.ts
+++ b/packages/platform/src/internal/httpRouter.ts
@@ -200,6 +200,9 @@ class RouterImpl<E = never, R = never> extends Effectable.StructuralClass<
   toString() {
     return Inspectable.format(this)
   }
+  [Inspectable.DenoInspectSymbol]() {
+    return this.toJSON()
+  }
   [Inspectable.NodeInspectSymbol]() {
     return this.toJSON()
   }
diff --git a/packages/platform/src/internal/httpServerResponse.ts b/packages/platform/src/internal/httpServerResponse.ts
index 6648e665559..17cbb4e8d59 100644
--- a/packages/platform/src/internal/httpServerResponse.ts
+++ b/packages/platform/src/internal/httpServerResponse.ts
@@ -62,6 +62,9 @@ class ServerResponseImpl extends Effectable.StructuralClass<ServerResponse.HttpS
     return Effect.succeed(this)
   }
 
+  [Inspectable.DenoInspectSymbol]() {
+    return this.toJSON()
+  }
   [Inspectable.NodeInspectSymbol]() {
     return this.toJSON()
   }
diff --git a/packages/schema/src/ParseResult.ts b/packages/schema/src/ParseResult.ts
index a07ba2c1cb8..50e7c8b98b3 100644
--- a/packages/schema/src/ParseResult.ts
+++ b/packages/schema/src/ParseResult.ts
@@ -263,6 +263,12 @@ export class ParseError extends TaggedError("ParseError")<{ readonly issue: Pars
   [Inspectable.NodeInspectSymbol]() {
     return this.toJSON()
   }
+  /**
+   * @since 0.75.0
+   */
+  [Inspectable.DenoInspectSymbol]() {
+    return this.toJSON()
+  }
 }
 
 /**
diff --git a/packages/schema/test/Schema/Class/TaggedError.test.ts b/packages/schema/test/Schema/Class/TaggedError.test.ts
index f14173d0999..42a05aabe79 100644
--- a/packages/schema/test/Schema/Class/TaggedError.test.ts
+++ b/packages/schema/test/Schema/Class/TaggedError.test.ts
@@ -118,5 +118,7 @@ describe("TaggedError", () => {
     expect(Cause.pretty(Cause.fail(err), { renderErrorCause: true })).includes("[cause]: Error: child")
     // ensure node renders the error directly
     expect(err[Inspectable.NodeInspectSymbol]()).toEqual(err)
+    // ensure deno renders the error directly
+    expect(err[Inspectable.DenoInspectSymbol]()).toEqual(err)
   })
 })