diff --git a/.semversioner/next-release/patch-20250306224613336336.json b/.semversioner/next-release/patch-20250306224613336336.json
new file mode 100644
index 0000000000..087d1d4aa3
--- /dev/null
+++ b/.semversioner/next-release/patch-20250306224613336336.json
@@ -0,0 +1,4 @@
+{
+  "type": "patch",
+  "description": "add support for cosmosdb to use url+AccountKey based authentication"
+}
diff --git a/graphrag/vector_stores/cosmosdb.py b/graphrag/vector_stores/cosmosdb.py
index 9c736076bf..8c5ede12b7 100644
--- a/graphrag/vector_stores/cosmosdb.py
+++ b/graphrag/vector_stores/cosmosdb.py
@@ -40,9 +40,15 @@ def connect(self, **kwargs: Any) -> Any:
             if not url:
                 msg = "Either connection_string or url must be provided."
                 raise ValueError(msg)
-            self._cosmos_client = CosmosClient(
-                url=url, credential=DefaultAzureCredential()
-            )
+            access_key = kwargs.get("api_key")
+            if access_key:
+                self._cosmos_client = CosmosClient(
+                                url=url, credential=access_key
+                            )
+            else:
+                self._cosmos_client = CosmosClient(
+                    url=url, credential=DefaultAzureCredential()
+                )
 
         database_name = kwargs.get("database_name")
         if database_name is None: