diff --git a/projects/plugins/jetpack/changelog/get_author-add-wpcom-filter b/projects/plugins/jetpack/changelog/get_author-add-wpcom-filter
new file mode 100644
index 0000000000000..00dad7f6cdb47
--- /dev/null
+++ b/projects/plugins/jetpack/changelog/get_author-add-wpcom-filter
@@ -0,0 +1,4 @@
+Significance: patch
+Type: other
+
+get_author: wpcom: Add a new wpcom_api_pre_get_active_blog_author filter
diff --git a/projects/plugins/jetpack/class.json-api-endpoints.php b/projects/plugins/jetpack/class.json-api-endpoints.php
index da9f96abbe3ca..11bf848542e68 100644
--- a/projects/plugins/jetpack/class.json-api-endpoints.php
+++ b/projects/plugins/jetpack/class.json-api-endpoints.php
@@ -1451,8 +1451,25 @@ public function get_author( $author, $show_email_and_ip = false ) {
 				$nice       = $user->user_nicename;
 			}
 			if ( defined( 'IS_WPCOM' ) && IS_WPCOM && ! $is_jetpack ) {
-				$active_blog = get_active_blog_for_user( $id );
-				$site_id     = $active_blog->blog_id;
+				$site_id = -1;
+
+				/**
+				 * Allow customizing the blog ID returned with the author in WordPress.com REST API queries.
+				 *
+				 * @since $$next-version$$
+				 *
+				 * @module json-api
+				 *
+				 * @param bool|int $active_blog  Blog ID, or false by default.
+				 * @param int      $id           User ID.
+				 */
+				$active_blog = apply_filters( 'wpcom_api_pre_get_active_blog_author', false, $id );
+				if ( false === $active_blog ) {
+					$active_blog = get_active_blog_for_user( $id );
+				}
+				if ( ! empty( $active_blog ) ) {
+					$site_id = $active_blog->blog_id;
+				}
 				if ( $site_id > -1 ) {
 					$site_visible = (
 						-1 !== (int) $active_blog->public ||