diff --git a/langchain/src/document_loaders/web/azure_blob_storage_container.ts b/langchain/src/document_loaders/web/azure_blob_storage_container.ts
index 076f09f1ae6f..924d5843f27d 100644
--- a/langchain/src/document_loaders/web/azure_blob_storage_container.ts
+++ b/langchain/src/document_loaders/web/azure_blob_storage_container.ts
@@ -59,7 +59,12 @@ export class AzureBlobStorageContainerLoader extends BaseDocumentLoader {
    */
   public async load() {
     const blobServiceClient = BlobServiceClient.fromConnectionString(
-      this.connectionString
+      this.connectionString,
+      {
+        userAgentOptions: {
+          userAgentPrefix: "langchainjs-blob-storage-container",
+        },
+      }
     );
 
     const containerClient = blobServiceClient.getContainerClient(
diff --git a/langchain/src/document_loaders/web/azure_blob_storage_file.ts b/langchain/src/document_loaders/web/azure_blob_storage_file.ts
index 83f3f04e6e90..0b1b69d3324d 100644
--- a/langchain/src/document_loaders/web/azure_blob_storage_file.ts
+++ b/langchain/src/document_loaders/web/azure_blob_storage_file.ts
@@ -80,7 +80,12 @@ export class AzureBlobStorageFileLoader extends BaseDocumentLoader {
 
     try {
       const blobServiceClient = BlobServiceClient.fromConnectionString(
-        this.connectionString
+        this.connectionString,
+        {
+          userAgentOptions: {
+            userAgentPrefix: "langchainjs-blob-storage-file",
+          },
+        }
       );
 
       const containerClient = blobServiceClient.getContainerClient(
diff --git a/libs/langchain-azure-openai/src/chat_models.ts b/libs/langchain-azure-openai/src/chat_models.ts
index ecc549943401..9361e5929446 100644
--- a/libs/langchain-azure-openai/src/chat_models.ts
+++ b/libs/langchain-azure-openai/src/chat_models.ts
@@ -56,6 +56,7 @@ import {
   FunctionDef,
   formatFunctionDefinitions,
 } from "./utils/openai-format-fndef.js";
+import { USER_AGENT_PREFIX } from "./constants.js";
 
 function _convertDeltaToMessageChunk(
   delta: ChatResponseMessage,
@@ -302,12 +303,18 @@ export class AzureChatOpenAI
     if (isTokenCredential(azureCredential)) {
       this.client = new AzureOpenAIClient(
         this.azureOpenAIEndpoint ?? "",
-        azureCredential as TokenCredential
+        azureCredential as TokenCredential,
+        {
+          userAgentOptions: { userAgentPrefix: USER_AGENT_PREFIX },
+        }
       );
     } else {
       this.client = new AzureOpenAIClient(
         this.azureOpenAIEndpoint ?? "",
-        azureCredential as KeyCredential
+        azureCredential as KeyCredential,
+        {
+          userAgentOptions: { userAgentPrefix: USER_AGENT_PREFIX },
+        }
       );
     }
   }
diff --git a/libs/langchain-azure-openai/src/constants.ts b/libs/langchain-azure-openai/src/constants.ts
new file mode 100644
index 000000000000..9fee1c3806bd
--- /dev/null
+++ b/libs/langchain-azure-openai/src/constants.ts
@@ -0,0 +1 @@
+export const USER_AGENT_PREFIX = "langchainjs-azure-openai";
diff --git a/libs/langchain-azure-openai/src/embeddings.ts b/libs/langchain-azure-openai/src/embeddings.ts
index 2c50d992fea0..b799caba4454 100644
--- a/libs/langchain-azure-openai/src/embeddings.ts
+++ b/libs/langchain-azure-openai/src/embeddings.ts
@@ -13,6 +13,7 @@ import {
 import { getEnvironmentVariable } from "@langchain/core/utils/env";
 import { chunkArray } from "@langchain/core/utils/chunk_array";
 import { AzureOpenAIInput, AzureOpenAIEmbeddingsParams } from "./types.js";
+import { USER_AGENT_PREFIX } from "./constants.js";
 
 export class AzureOpenAIEmbeddings
   extends Embeddings
@@ -96,12 +97,18 @@ export class AzureOpenAIEmbeddings
     if (isTokenCredential(azureCredential)) {
       this.client = new AzureOpenAIClient(
         this.azureOpenAIEndpoint ?? "",
-        azureCredential as TokenCredential
+        azureCredential as TokenCredential,
+        {
+          userAgentOptions: { userAgentPrefix: USER_AGENT_PREFIX },
+        }
       );
     } else {
       this.client = new AzureOpenAIClient(
         this.azureOpenAIEndpoint ?? "",
-        azureCredential as KeyCredential
+        azureCredential as KeyCredential,
+        {
+          userAgentOptions: { userAgentPrefix: USER_AGENT_PREFIX },
+        }
       );
     }
   }
diff --git a/libs/langchain-azure-openai/src/llms.ts b/libs/langchain-azure-openai/src/llms.ts
index 167dad574f84..4e466d9623f7 100644
--- a/libs/langchain-azure-openai/src/llms.ts
+++ b/libs/langchain-azure-openai/src/llms.ts
@@ -22,6 +22,7 @@ import {
   isTokenCredential,
 } from "@azure/core-auth";
 import { AzureOpenAIInput, OpenAICallOptions, OpenAIInput } from "./types.js";
+import { USER_AGENT_PREFIX } from "./constants.js";
 
 /**
  * Interface for tracking token usage in OpenAI calls.
@@ -175,12 +176,18 @@ export class AzureOpenAI<
     if (isTokenCredential(azureCredential)) {
       this.client = new AzureOpenAIClient(
         this.azureOpenAIEndpoint ?? "",
-        azureCredential as TokenCredential
+        azureCredential as TokenCredential,
+        {
+          userAgentOptions: { userAgentPrefix: USER_AGENT_PREFIX },
+        }
       );
     } else {
       this.client = new AzureOpenAIClient(
         this.azureOpenAIEndpoint ?? "",
-        azureCredential as KeyCredential
+        azureCredential as KeyCredential,
+        {
+          userAgentOptions: { userAgentPrefix: USER_AGENT_PREFIX },
+        }
       );
     }
   }
diff --git a/libs/langchain-community/src/vectorstores/azure_aisearch.ts b/libs/langchain-community/src/vectorstores/azure_aisearch.ts
index 3a4bd118d47d..05684486bea2 100644
--- a/libs/langchain-community/src/vectorstores/azure_aisearch.ts
+++ b/libs/langchain-community/src/vectorstores/azure_aisearch.ts
@@ -93,6 +93,7 @@ export type AzureAISearchFilterType = {
   includeEmbeddings?: boolean;
 };
 
+const USER_AGENT_PREFIX = "langchainjs-azure-aisearch";
 const DEFAULT_FIELD_ID = "id";
 const DEFAULT_FIELD_CONTENT = "content";
 const DEFAULT_FIELD_CONTENT_VECTOR = "content_vector";
@@ -151,9 +152,13 @@ export class AzureAISearchVectorStore extends VectorStore {
       // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
       const credential = new AzureKeyCredential(key!);
       // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-      this.client = new SearchClient(endpoint!, this.indexName, credential);
+      this.client = new SearchClient(endpoint!, this.indexName, credential, {
+        userAgentOptions: { userAgentPrefix: USER_AGENT_PREFIX },
+      });
       // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-      const indexClient = new SearchIndexClient(endpoint!, credential);
+      const indexClient = new SearchIndexClient(endpoint!, credential, {
+        userAgentOptions: { userAgentPrefix: USER_AGENT_PREFIX },
+      });
 
       // Start initialization, but don't wait for it to finish here
       this.initPromise = this.ensureIndexExists(indexClient).catch((error) => {
diff --git a/libs/langchain-community/src/vectorstores/azure_cosmosdb.ts b/libs/langchain-community/src/vectorstores/azure_cosmosdb.ts
index c9cc7d7e4d59..16983cd008cc 100644
--- a/libs/langchain-community/src/vectorstores/azure_cosmosdb.ts
+++ b/libs/langchain-community/src/vectorstores/azure_cosmosdb.ts
@@ -93,7 +93,9 @@ export class AzureCosmosDBVectorStore extends VectorStore {
 
     if (!dbConfig.client) {
       // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-      this.client = new MongoClient(connectionString!);
+      this.client = new MongoClient(connectionString!, {
+        appName: "langchainjs",
+      });
     }
 
     // eslint-disable-next-line @typescript-eslint/no-non-null-assertion