diff --git a/src/google/adk/tools/bigquery/config.py b/src/google/adk/tools/bigquery/config.py
index 64560ace..7768f214 100644
--- a/src/google/adk/tools/bigquery/config.py
+++ b/src/google/adk/tools/bigquery/config.py
@@ -80,7 +80,9 @@ class BigQueryToolConfig(BaseModel):
 
   By default, no particular application name will be set in the BigQuery
   interaction. But if the tool user (agent builder) wants to differentiate
-  their application/agent for tracking or support purpose, they can set this field.
+  their application/agent for tracking or support purpose, they can set this
+  field. If set, this value will be added to the user_agent in BigQuery API calls, and also to the BigQuery job labels with the key
+  "adk-bigquery-application-name".
   """
 
   compute_project_id: Optional[str] = None
diff --git a/src/google/adk/tools/bigquery/query_tool.py b/src/google/adk/tools/bigquery/query_tool.py
index 5f40989e..666dc3c5 100644
--- a/src/google/adk/tools/bigquery/query_tool.py
+++ b/src/google/adk/tools/bigquery/query_tool.py
@@ -71,6 +71,8 @@ def _execute_sql(
     bq_job_labels = {}
     if caller_id:
       bq_job_labels["adk-bigquery-tool"] = caller_id
+    if settings and settings.application_name:
+      bq_job_labels["adk-bigquery-application-name"] = settings.application_name
 
     if not settings or settings.write_mode == WriteMode.BLOCKED:
       dry_run_query_job = bq_client.query(
diff --git a/tests/unittests/tools/bigquery/test_bigquery_query_tool.py b/tests/unittests/tools/bigquery/test_bigquery_query_tool.py
index 5482ad0b..eef83a1f 100644
--- a/tests/unittests/tools/bigquery/test_bigquery_query_tool.py
+++ b/tests/unittests/tools/bigquery/test_bigquery_query_tool.py
@@ -1673,7 +1673,9 @@ def test_execute_sql_job_labels(
   query = "SELECT 123 AS num"
   statement_type = "SELECT"
   credentials = mock.create_autospec(Credentials, instance=True)
-  tool_settings = BigQueryToolConfig(write_mode=write_mode)
+  tool_settings = BigQueryToolConfig(
+      write_mode=write_mode, application_name="test-app"
+  )
   tool_context = mock.create_autospec(ToolContext, instance=True)
   tool_context.state.get.return_value = None
 
@@ -1702,12 +1704,13 @@ def test_execute_sql_job_labels(
       for call_args in call_args_list:
         _, mock_kwargs = call_args
         assert mock_kwargs["job_config"].labels == {
-            "adk-bigquery-tool": "execute_sql"
+            "adk-bigquery-tool": "execute_sql",
+            "adk-bigquery-application-name": "test-app",
         }
 
 
 @pytest.mark.parametrize(
-    ("tool_call", "expected_label"),
+    ("tool_call", "expected_tool_label"),
     [
         pytest.param(
             lambda tool_context: query_tool.forecast(
@@ -1751,7 +1754,7 @@ def test_execute_sql_job_labels(
         ),
     ],
 )
-def test_ml_tool_job_labels(tool_call, expected_label):
+def test_ml_tool_job_labels(tool_call, expected_tool_label):
   """Test ML tools for job label."""
 
   with mock.patch.object(bigquery, "Client", autospec=True) as Client:
@@ -1768,10 +1771,85 @@ def test_ml_tool_job_labels(tool_call, expected_label):
       for call_args in call_args_list:
         _, mock_kwargs = call_args
         assert mock_kwargs["job_config"].labels == {
-            "adk-bigquery-tool": expected_label
+            "adk-bigquery-tool": expected_tool_label
         }
 
 
+@pytest.mark.parametrize(
+    ("tool_call", "expected_tool_label"),
+    [
+        pytest.param(
+            lambda tool_context: query_tool.forecast(
+                project_id="test-project",
+                history_data="SELECT * FROM `test-dataset.test-table`",
+                timestamp_col="ts_col",
+                data_col="data_col",
+                credentials=mock.create_autospec(Credentials, instance=True),
+                settings=BigQueryToolConfig(
+                    write_mode=WriteMode.ALLOWED, application_name="test-app"
+                ),
+                tool_context=tool_context,
+            ),
+            "forecast",
+            id="forecast-app-name",
+        ),
+        pytest.param(
+            lambda tool_context: query_tool.analyze_contribution(
+                project_id="test-project",
+                input_data="test-dataset.test-table",
+                dimension_id_cols=["dim1", "dim2"],
+                contribution_metric="SUM(metric)",
+                is_test_col="is_test",
+                credentials=mock.create_autospec(Credentials, instance=True),
+                settings=BigQueryToolConfig(
+                    write_mode=WriteMode.ALLOWED, application_name="test-app"
+                ),
+                tool_context=tool_context,
+            ),
+            "analyze_contribution",
+            id="analyze-contribution-app-name",
+        ),
+        pytest.param(
+            lambda tool_context: query_tool.detect_anomalies(
+                project_id="test-project",
+                history_data="SELECT * FROM `test-dataset.test-table`",
+                times_series_timestamp_col="ts_timestamp",
+                times_series_data_col="ts_data",
+                credentials=mock.create_autospec(Credentials, instance=True),
+                settings=BigQueryToolConfig(
+                    write_mode=WriteMode.ALLOWED, application_name="test-app"
+                ),
+                tool_context=tool_context,
+            ),
+            "detect_anomalies",
+            id="detect-anomalies-app-name",
+        ),
+    ],
+)
+def test_ml_tool_job_labels_w_application_name(tool_call, expected_tool_label):
+  """Test ML tools for job label with application name."""
+
+  with mock.patch.object(bigquery, "Client", autospec=True) as Client:
+    bq_client = Client.return_value
+
+    tool_context = mock.create_autospec(ToolContext, instance=True)
+    tool_context.state.get.return_value = None
+    tool_call(tool_context)
+
+    expected_labels = {
+        "adk-bigquery-tool": expected_tool_label,
+        "adk-bigquery-application-name": "test-app",
+    }
+
+    for call_args_list in [
+        bq_client.query.call_args_list,
+        bq_client.query_and_wait.call_args_list,
+    ]:
+      for call_args in call_args_list:
+        _, mock_kwargs = call_args
+        assert mock_kwargs["job_config"].labels == expected_labels
+
+
 def test_execute_sql_max_rows_config():
   """Test execute_sql tool respects max_query_result_rows from config."""
   project = "my_project"