diff --git a/components/google-cloud/RELEASE.md b/components/google-cloud/RELEASE.md
index 3e1c72cb3e1..3cc17345d65 100644
--- a/components/google-cloud/RELEASE.md
+++ b/components/google-cloud/RELEASE.md
@@ -1,6 +1,7 @@
 ## Upcoming release
 * Remove default prediction column names in `v1.model_evaluation.regression_component` component to fix pipeline errors when using bigquery data source.
 * Add reservation_affinition support in `v1.create_custom_training_job_from_component`.
+* Deprecate `preview.custom_job` module.
 
 ## Release 2.17.0
 * Fix Gemini batch prediction support to `v1.model_evaluation.autosxs_pipeline` after output schema change.
diff --git a/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/__init__.py b/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/__init__.py
index ac8c9aeb782..83e29bf53af 100644
--- a/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/__init__.py
+++ b/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/__init__.py
@@ -17,6 +17,15 @@
 customized worker and cloud configurations.
 """
 # fmt: on
+import warnings
+
+warnings.warn(
+    (
+        '`preview.custom_job` is deprecated and will be removed in a future '
+        'version. Please use `v1.custom_job` instead.'
+    ),
+    category=DeprecationWarning,
+)
 
 from google_cloud_pipeline_components.preview.custom_job.component import custom_training_job as CustomTrainingJobOp
 from google_cloud_pipeline_components.preview.custom_job.utils import create_custom_training_job_from_component