diff --git a/wp-includes/block-patterns.php b/wp-includes/block-patterns.php
index e93c406191..a2d90a261e 100644
--- a/wp-includes/block-patterns.php
+++ b/wp-includes/block-patterns.php
@@ -12,6 +12,7 @@ add_theme_support( 'core-block-patterns' );
  * Registers the core block patterns and categories.
  *
  * @since 5.5.0
+ * @since 6.3.0 Added source to core block patterns.
  * @access private
  */
 function _register_core_block_patterns_and_categories() {
@@ -29,10 +30,9 @@ function _register_core_block_patterns_and_categories() {
 		);
 
 		foreach ( $core_block_patterns as $core_block_pattern ) {
-			register_block_pattern(
-				'core/' . $core_block_pattern,
-				require __DIR__ . '/block-patterns/' . $core_block_pattern . '.php'
-			);
+			$pattern           = require __DIR__ . '/block-patterns/' . $core_block_pattern . '.php';
+			$pattern['source'] = 'core';
+			register_block_pattern( 'core/' . $core_block_pattern, $pattern );
 		}
 	}
 
@@ -190,6 +190,7 @@ function wp_normalize_remote_block_pattern( $pattern ) {
  * @since 5.9.0 The $current_screen argument was removed.
  * @since 6.2.0 Normalize the pattern from the API (snake_case) to the
  *              format expected by `register_block_pattern` (camelCase).
+ * @since 6.3.0 Add 'pattern-directory/core' to the pattern's 'source'.
  *
  * @param WP_Screen $deprecated Unused. Formerly the screen that the current request was triggered from.
  */
@@ -224,6 +225,7 @@ function _load_remote_block_patterns( $deprecated = null ) {
 		$patterns = $response->get_data();
 
 		foreach ( $patterns as $pattern ) {
+			$pattern['source']  = 'pattern-directory/core';
 			$normalized_pattern = wp_normalize_remote_block_pattern( $pattern );
 			$pattern_name       = 'core/' . sanitize_title( $normalized_pattern['title'] );
 			register_block_pattern( $pattern_name, $normalized_pattern );
@@ -237,6 +239,7 @@ function _load_remote_block_patterns( $deprecated = null ) {
  * @since 5.9.0
  * @since 6.2.0 Normalized the pattern from the API (snake_case) to the
  *              format expected by `register_block_pattern()` (camelCase).
+ * @since 6.3.0 Add 'pattern-directory/featured' to the pattern's 'source'.
  */
 function _load_remote_featured_patterns() {
 	$supports_core_patterns = get_theme_support( 'core-block-patterns' );
@@ -258,6 +261,7 @@ function _load_remote_featured_patterns() {
 	$patterns = $response->get_data();
 	$registry = WP_Block_Patterns_Registry::get_instance();
 	foreach ( $patterns as $pattern ) {
+		$pattern['source']  = 'pattern-directory/featured';
 		$normalized_pattern = wp_normalize_remote_block_pattern( $pattern );
 		$pattern_name       = sanitize_title( $normalized_pattern['title'] );
 		// Some patterns might be already registered as core patterns with the `core` prefix.
@@ -275,6 +279,7 @@ function _load_remote_featured_patterns() {
  * @since 6.0.0
  * @since 6.2.0 Normalized the pattern from the API (snake_case) to the
  *              format expected by `register_block_pattern()` (camelCase).
+ * @since 6.3.0 Add 'pattern-directory/theme' to the pattern's 'source'.
  * @access private
  */
 function _register_remote_theme_patterns() {
@@ -301,6 +306,7 @@ function _register_remote_theme_patterns() {
 	$patterns          = $response->get_data();
 	$patterns_registry = WP_Block_Patterns_Registry::get_instance();
 	foreach ( $patterns as $pattern ) {
+		$pattern['source']  = 'pattern-directory/theme';
 		$normalized_pattern = wp_normalize_remote_block_pattern( $pattern );
 		$pattern_name       = sanitize_title( $normalized_pattern['title'] );
 		// Some patterns might be already registered as core patterns with the `core` prefix.
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-block-patterns-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-block-patterns-controller.php
index 445f8c82f6..3acaefdf2c 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-block-patterns-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-block-patterns-controller.php
@@ -155,6 +155,7 @@ class WP_REST_Block_Patterns_Controller extends WP_REST_Controller {
 	 * Prepare a raw block pattern before it gets output in a REST API response.
 	 *
 	 * @since 6.0.0
+	 * @since 6.3.0 Added `source` property.
 	 *
 	 * @param array           $item    Raw pattern as registered, before any changes.
 	 * @param WP_REST_Request $request Request object.
@@ -174,6 +175,7 @@ class WP_REST_Block_Patterns_Controller extends WP_REST_Controller {
 			'blockTypes'    => 'block_types',
 			'postTypes'     => 'post_types',
 			'templateTypes' => 'template_types',
+			'source'        => 'source',
 		);
 		$data   = array();
 		foreach ( $keys as $item_key => $rest_key ) {
@@ -192,6 +194,7 @@ class WP_REST_Block_Patterns_Controller extends WP_REST_Controller {
 	 * Retrieves the block pattern schema, conforming to JSON Schema.
 	 *
 	 * @since 6.0.0
+	 * @since 6.3.0 Added `source` property.
 	 *
 	 * @return array Item schema data.
 	 */
@@ -267,6 +270,20 @@ class WP_REST_Block_Patterns_Controller extends WP_REST_Controller {
 					'readonly'    => true,
 					'context'     => array( 'view', 'edit', 'embed' ),
 				),
+				'source'         => array(
+					'description' => __( 'Where the pattern comes from e.g. core' ),
+					'type'        => 'string',
+					'readonly'    => true,
+					'context'     => array( 'view', 'edit', 'embed' ),
+					'enum'        => array(
+						'core',
+						'plugin',
+						'theme',
+						'pattern-directory/core',
+						'pattern-directory/theme',
+						'pattern-directory/featured',
+					),
+				),
 			),
 		);
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ff39a3dd5c..ed631625f4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-56062';
+$wp_version = '6.3-alpha-56063';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.