diff --git a/tests/test_litellm/proxy/vector_store_endpoints/test_vector_store_access_control.py b/tests/test_litellm/proxy/vector_store_endpoints/test_vector_store_access_control.py
new file mode 100644
index 00000000000..42043c6d168
--- /dev/null
+++ b/tests/test_litellm/proxy/vector_store_endpoints/test_vector_store_access_control.py
@@ -0,0 +1,87 @@
+"""
+Test vector store access control based on team membership.
+
+Core tests:
+1. Access control logic works correctly for different team scenarios
+2. Delete endpoint enforces team access control
+"""
+
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+from fastapi import HTTPException
+
+from litellm.proxy._types import UserAPIKeyAuth
+from litellm.proxy.vector_store_endpoints.management_endpoints import (
+    _check_vector_store_access,
+)
+from litellm.types.vector_stores import LiteLLM_ManagedVectorStore
+
+
+def test_check_vector_store_access():
+    """Test core access control logic for team-based vector store access"""
+    
+    # Test 1: Legacy vector stores (no team_id) are accessible to all
+    vector_store: LiteLLM_ManagedVectorStore = {
+        "vector_store_id": "vs_legacy",
+        "custom_llm_provider": "openai",
+        "team_id": None,
+    }
+    user = UserAPIKeyAuth(team_id="team_456")
+    assert _check_vector_store_access(vector_store, user) is True
+    
+    # Test 2: User can access their team's vector stores
+    vector_store = {
+        "vector_store_id": "vs_team",
+        "custom_llm_provider": "openai",
+        "team_id": "team_456",
+    }
+    user = UserAPIKeyAuth(team_id="team_456")
+    assert _check_vector_store_access(vector_store, user) is True
+    
+    # Test 3: User cannot access other teams' vector stores
+    vector_store = {
+        "vector_store_id": "vs_team",
+        "custom_llm_provider": "openai",
+        "team_id": "team_456",
+    }
+    user = UserAPIKeyAuth(team_id="team_789")
+    assert _check_vector_store_access(vector_store, user) is False
+
+
+@pytest.mark.asyncio
+async def test_delete_vector_store_checks_access():
+    """Test that delete endpoint enforces team access control"""
+    from litellm.proxy.vector_store_endpoints.management_endpoints import (
+        delete_vector_store,
+    )
+    from litellm.types.vector_stores import VectorStoreDeleteRequest
+
+    mock_prisma = MagicMock()
+    mock_vector_store = MagicMock(
+        model_dump=lambda: {
+            "vector_store_id": "vs_123",
+            "custom_llm_provider": "openai",
+            "team_id": "team_456",
+        }
+    )
+    mock_prisma.db.litellm_managedvectorstorestable.find_unique = AsyncMock(
+        return_value=mock_vector_store
+    )
+
+    # User from different team should get 403
+    user_api_key_dict = UserAPIKeyAuth(team_id="team_789")
+    request = VectorStoreDeleteRequest(vector_store_id="vs_123")
+
+    with patch(
+        "litellm.proxy.vector_store_endpoints.management_endpoints.prisma_client",
+        mock_prisma,
+    ):
+        with patch("litellm.vector_store_registry", None):
+            with pytest.raises(HTTPException) as exc_info:
+                await delete_vector_store(
+                    data=request, user_api_key_dict=user_api_key_dict
+                )
+
+            assert exc_info.value.status_code == 403
+            assert "Access denied" in exc_info.value.detail