diff --git a/.changes/unreleased/Fixes-20231113-154535.yaml b/.changes/unreleased/Fixes-20231113-154535.yaml
new file mode 100644
index 00000000000..13b900ec2dd
--- /dev/null
+++ b/.changes/unreleased/Fixes-20231113-154535.yaml
@@ -0,0 +1,6 @@
+kind: Fixes
+body: Use seed value if rows not specified
+time: 2023-11-13T15:45:35.008565Z
+custom:
+  Author: aranke
+  Issue: "8652"
diff --git a/core/dbt/parser/unit_tests.py b/core/dbt/parser/unit_tests.py
index c93f70b2997..91a977400b8 100644
--- a/core/dbt/parser/unit_tests.py
+++ b/core/dbt/parser/unit_tests.py
@@ -1,5 +1,9 @@
+from csv import DictReader
+from pathlib import Path
 from typing import List, Set, Dict, Any
 
+from dbt_extractor import py_extract_from_source, ExtractionError  # type: ignore
+
 from dbt.config import RuntimeConfig
 from dbt.context.context_config import ContextConfig
 from dbt.context.providers import generate_parse_exposure, get_rendered
@@ -14,7 +18,7 @@
     UnitTestConfig,
 )
 from dbt.contracts.graph.unparsed import UnparsedUnitTest
-from dbt.exceptions import ParsingError, InvalidUnitTestGivenInput
+from dbt.exceptions import ParsingError, InvalidUnitTestGivenInput, DbtInternalError
 from dbt.graph import UniqueId
 from dbt.node_types import NodeType
 from dbt.parser.schemas import (
@@ -27,7 +31,6 @@
     ParseResult,
 )
 from dbt.utils import get_pseudo_test_path
-from dbt_extractor import py_extract_from_source, ExtractionError  # type: ignore
 
 
 class UnitTestManifestLoader:
@@ -203,6 +206,22 @@ def __init__(self, schema_parser: SchemaParser, yaml: YamlBlock) -> None:
         self.schema_parser = schema_parser
         self.yaml = yaml
 
+    def load_rows_from_seed(self, seed_name):
+        rows = []
+
+        try:
+            seed_node = self.manifest.ref_lookup.perform_lookup(
+                f"seed.{self.project.project_name}.{seed_name}", self.manifest
+            )
+            seed_path = Path(seed_node.root_path) / seed_node.original_file_path
+            with open(seed_path, "r") as f:
+                for row in DictReader(f):
+                    rows.append(row)
+        except DbtInternalError:
+            pass
+        finally:
+            return rows
+
     def parse(self) -> ParseResult:
         for data in self.get_key_dicts():
             unit_test = self._get_unit_test(data)
@@ -214,8 +233,12 @@ def parse(self) -> ParseResult:
             unit_test_fqn = [self.project.project_name] + model_name_split + [unit_test.name]
             unit_test_config = self._build_unit_test_config(unit_test_fqn, unit_test.config)
 
+            # self.manifest.ref_lookup.perform_lookup('seed.test.my_favorite_source', self.manifest)
+
             # Check that format and type of rows matches for each given input
             for input in unit_test.given:
+                if input.rows is None:
+                    input.rows = self.load_rows_from_seed(input.input.split("'")[1])
                 input.validate_fixture("input", unit_test.name)
             unit_test.expect.validate_fixture("expected", unit_test.name)
 
diff --git a/tests/functional/unit_testing/test_unit_testing.py b/tests/functional/unit_testing/test_unit_testing.py
index 2a631c23efe..e475f162e96 100644
--- a/tests/functional/unit_testing/test_unit_testing.py
+++ b/tests/functional/unit_testing/test_unit_testing.py
@@ -100,3 +100,64 @@ def test_basic(self, project):
         # Select by model name
         results = run_dbt(["unit-test", "--select", "my_incremental_model"], expect_pass=True)
         assert len(results) == 2
+
+
+my_new_model = """
+select
+my_favorite_seed.id,
+a + b as c
+from {{ ref('my_favorite_seed') }} as my_favorite_seed
+inner join {{ ref('my_favorite_model') }} as my_favorite_model
+on my_favorite_seed.id = my_second_favorite_model.id
+"""
+
+my_second_favorite_model = """
+select
+2 as id,
+3 as b
+"""
+
+seed_my_favorite_seed = """id,a
+1,5
+2,4
+3,3
+4,2
+5,1
+"""
+
+test_my_model_implicit_seed = """
+unit_tests:
+  - name: t
+    model: my_new_model
+    given:
+      - input: ref('my_favorite_seed')
+      - input: ref('my_second_favorite_model')
+        rows:
+          - {id: 1, b: 2}
+    expect:
+      rows:
+        - {id: 1, c: 7}
+"""
+
+
+class TestUnitTestImplicitSeed:
+    @pytest.fixture(scope="class")
+    def seeds(self):
+        return {"my_favorite_seed.csv": seed_my_favorite_seed}
+
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "my_new_model.sql": my_new_model,
+            "my_second_favorite_model.sql": my_second_favorite_model,
+            "schema.yml": test_my_model_implicit_seed,
+        }
+
+    def test_basic(self, project):
+        run_dbt(["seed"])
+        run_dbt(["run"])
+        # assert len(results) == 1
+
+        # Select by model name
+        results = run_dbt(["unit-test", "--select", "my_new_model"], expect_pass=True)
+        assert len(results) == 1