diff --git a/src/azure-cli/azure/cli/command_modules/cognitiveservices/_client_factory.py b/src/azure-cli/azure/cli/command_modules/cognitiveservices/_client_factory.py
index a31eed3f200..1dc069c9107 100644
--- a/src/azure-cli/azure/cli/command_modules/cognitiveservices/_client_factory.py
+++ b/src/azure-cli/azure/cli/command_modules/cognitiveservices/_client_factory.py
@@ -40,3 +40,7 @@ def cf_models(cli_ctx, *_):
 
 def cf_usages(cli_ctx, *_):
     return get_cognitiveservices_management_client(cli_ctx).usages
+
+def cf_application(cli_ctx, *_):
+    print('cf_application called')
+    return get_cognitiveservices_management_client(cli_ctx)
diff --git a/src/azure-cli/azure/cli/command_modules/cognitiveservices/_params.py b/src/azure-cli/azure/cli/command_modules/cognitiveservices/_params.py
index 7f6183eba58..42f56ec1f65 100644
--- a/src/azure-cli/azure/cli/command_modules/cognitiveservices/_params.py
+++ b/src/azure-cli/azure/cli/command_modules/cognitiveservices/_params.py
@@ -214,3 +214,7 @@ def load_arguments(self, _):
     with self.argument_context('cognitiveservices account commitment-plan', arg_group='Next CommitmentPeriod') as c:
         c.argument('next_count', help='Cognitive Services account commitment plan next commitment period count.')
         c.argument('next_tier', help='Cognitive Services account commitment plan next commitment period tier.')
+
+    with self.argument_context('cognitiveservices application') as c:
+        c.argument('application_name', help='Cognitive Services application name')
+        
\ No newline at end of file
diff --git a/src/azure-cli/azure/cli/command_modules/cognitiveservices/commands.py b/src/azure-cli/azure/cli/command_modules/cognitiveservices/commands.py
index 53b736838c0..ffd42aeb36d 100644
--- a/src/azure-cli/azure/cli/command_modules/cognitiveservices/commands.py
+++ b/src/azure-cli/azure/cli/command_modules/cognitiveservices/commands.py
@@ -4,7 +4,7 @@
 # --------------------------------------------------------------------------------------------
 
 from azure.cli.core.commands import CliCommandType
-from azure.cli.command_modules.cognitiveservices._client_factory import cf_accounts, cf_resource_skus, \
+from azure.cli.command_modules.cognitiveservices._client_factory import cf_accounts, cf_application, cf_resource_skus, \
     cf_deleted_accounts, cf_deployments, cf_commitment_plans, cf_commitment_tiers, cf_models, cf_usages
 
 
@@ -39,6 +39,11 @@ def load_command_table(self, _):
         client_factory=cf_usages
     )
 
+    applications_type = CliCommandType(
+        # operations_tmpl='azure.cli.command_modules.cognitiveservices.commands#ApplicationClient.{}',
+        client_factory=cf_application
+    )
+
     with self.command_group('cognitiveservices account', accounts_type, client_factory=cf_accounts) as g:
         g.custom_command('create', 'create')
         g.command('delete', 'begin_delete')
@@ -103,3 +108,7 @@ def load_command_table(self, _):
 
     with self.command_group('cognitiveservices usage', usages_type) as g:
         g.command('list', 'list')
+
+    with self.command_group('cognitiveservices application', applications_type) as g:
+        g.custom_command('start', 'application_deployment_start', client_factory=cf_application)
+        g.custom_command('stop', 'application_deployment_stop', client_factory=cf_application)
diff --git a/src/azure-cli/azure/cli/command_modules/cognitiveservices/custom.py b/src/azure-cli/azure/cli/command_modules/cognitiveservices/custom.py
index fce86c7988f..5f054200d7d 100644
--- a/src/azure-cli/azure/cli/command_modules/cognitiveservices/custom.py
+++ b/src/azure-cli/azure/cli/command_modules/cognitiveservices/custom.py
@@ -325,3 +325,28 @@ def commitment_plan_create_or_update(
         plan.properties.next.count = next_count
     plan.properties.auto_renew = auto_renew
     return client.create_or_update(resource_group_name, account_name, commitment_plan_name, plan)
+
+def _app_deployment_url(client, resource_group_name, account_name, application_name, application_deployment_name):
+    url = f"/subscriptions/{client._config.subscription_id}/resourceGroups/{resource_group_name}/providers/Microsoft.CognitiveServices/accounts/{account_name}/applications/{application_name}/deployments/{application_deployment_name}"
+    return url
+
+def _application_deployment_command(client, resource_group_name, account_name, application_name, application_deployment_name, opname):
+    import azure.core.rest
+    request = azure.core.rest.HttpRequest(
+        method="POST",
+        url=_app_deployment_url(client, resource_group_name, account_name, application_name, application_deployment_name) + f"/{opname}",
+        params={'api-version': '2025-10-01-preview'}
+    )
+    response = client._send_request(
+        request
+    )
+    response.raise_for_status()
+
+def application_deployment_start(client, resource_group_name, account_name, appname, appdeploymentname):
+    """Start an application deployment."""
+    return _application_deployment_command(client, resource_group_name, account_name, appname, appdeploymentname, 'start')
+
+def application_deployment_stop(client, resource_group_name, account_name, appname, appdeploymentname):
+    """Stop an application deployment."""
+    return _application_deployment_command(client, resource_group_name, account_name, appname, appdeploymentname, 'stop')
+