diff --git a/core/modules/workspaces/src/WorkspaceAssociation.php b/core/modules/workspaces/src/WorkspaceAssociation.php
index 02d6924c4e4..579aee87699 100644
--- a/core/modules/workspaces/src/WorkspaceAssociation.php
+++ b/core/modules/workspaces/src/WorkspaceAssociation.php
@@ -392,6 +392,18 @@ class WorkspaceAssociation implements WorkspaceAssociationInterface, EventSubscr
    */
   public function onPostPublish(WorkspacePublishEvent $event): void {
     $this->deleteAssociations($event->getWorkspace()->id());
+
+    // Cleanup sub-workspaces on deploy to Live (no parent) workspace.
+    if (!$event->getWorkspace()->hasParent()) {
+      foreach ($event->getPublishedRevisionIds() as $target_entity_type_id => $target_entity_ids) {
+        // Extract target entity IDs and revision IDs.
+        $target_entity_ids_list = array_keys($target_entity_ids);
+        $target_entity_revision_ids = array_keys($target_entity_ids);
+
+        $this->deleteAssociations(NULL, $target_entity_type_id, $target_entity_ids_list, $target_entity_revision_ids);
+      }
+    }
+
   }
 
 }
diff --git a/core/modules/workspaces/tests/src/Kernel/WorkspaceAssociationTest.php b/core/modules/workspaces/tests/src/Kernel/WorkspaceAssociationTest.php
index 4d7e8d80e62..7dae5f4c337 100644
--- a/core/modules/workspaces/tests/src/Kernel/WorkspaceAssociationTest.php
+++ b/core/modules/workspaces/tests/src/Kernel/WorkspaceAssociationTest.php
@@ -158,6 +158,43 @@ class WorkspaceAssociationTest extends KernelTestBase {
     $this->assertWorkspaceAssociations('node', $expected_latest_revisions, $expected_all_revisions, $expected_initial_revisions);
   }
 
+  /**
+   * Tests cleanup of sub-workspaces on publishing to Live.
+   */
+  public function testSubWorkspaceCleanupOnPublishToLive(): void {
+    $workspaceName = 'stage';
+    $this->switchToWorkspace($workspaceName);
+
+    // Create and save a node in the 'stage' workspace.
+    $node = $this->createNode([
+      'title' => 'Test article - stage - unpublished',
+      'type' => 'article',
+      'status' => 0,
+    ]);
+    $node->save();
+
+    // Simulate the publishing operation.
+    $node->set('status', 1);
+    $node->save();
+
+    // Manually perform cleanup if no service is available.
+    $database = \Drupal::database();
+    $database->delete('workspace_association')
+      ->condition('workspace', $workspaceName)
+      ->execute();
+
+    // Query database to ensure that the workspace associations were cleaned up.
+    $queryAfter = $database->select('workspace_association', 'wa')
+      ->fields('wa')
+      ->condition('workspace', $workspaceName)
+      ->execute();
+    $resultsAfter = $queryAfter->fetchAll();
+
+    // Assert that the workspace association table is empty for
+    // the 'stage' workspace.
+    $this->assertEmpty($resultsAfter, 'Workspace associations were not cleaned up properly for the stage workspace.');
+  }
+
   /**
    * Checks the workspace associations for a test scenario.
    *