diff --git a/components/google-cloud/RELEASE.md b/components/google-cloud/RELEASE.md
index 3e1c72cb3e16..b52cc63803b9 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.create_custom_training_job_from_component` and `preview.custom_job.CustomTrainingJobOP`.
 
 ## 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/component.py b/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/component.py
index 585c9423e9cf..d64ce70d1619 100644
--- a/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/component.py
+++ b/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/component.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 from typing import Dict, List
+import warnings
 
 from google_cloud_pipeline_components import _image
 from google_cloud_pipeline_components import _placeholders
@@ -63,6 +64,13 @@ def custom_training_job(
     gcp_resources: Serialized JSON of `gcp_resources` [proto](https://github.com/kubeflow/pipelines/tree/master/components/google-cloud/google_cloud_pipeline_components/proto) which tracks the CustomJob.
   """
   # fmt: on
+  warnings.warn(
+      "'preview.custom_job.CustomTrainingJobOp' is"
+      ' deprecated and will be removed in a future release. Please use'
+      "'v1.custom_job.CustomTrainingJobOp' instead.",
+      DeprecationWarning,
+  )
+
   return dsl.ContainerSpec(
       image=_image.GCPC_IMAGE_TAG,
       command=[
diff --git a/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/utils.py b/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/utils.py
index ec5bdaa78263..e2697fad0a7b 100644
--- a/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/utils.py
+++ b/components/google-cloud/google_cloud_pipeline_components/preview/custom_job/utils.py
@@ -138,6 +138,13 @@ def create_custom_training_job_from_component(
   # After adding the appropriate description and the name, the new component
   # is returned.
 
+  warnings.warn(
+      "'preview.custom_job.create_custom_training_job_from_component' is"
+      ' deprecated and will be removed in a future release. Please use'
+      " 'v1.custom_job.create_custom_training_job_from_component' instead.",
+      DeprecationWarning,
+  )
+
   cj_pipeline_spec = json_format.MessageToDict(
       component.custom_training_job.pipeline_spec
   )