diff --git a/lib/compat/wordpress-6.7/rest-api.php b/lib/compat/wordpress-6.7/rest-api.php
index c5e2927198da0..97887d6ddace9 100644
--- a/lib/compat/wordpress-6.7/rest-api.php
+++ b/lib/compat/wordpress-6.7/rest-api.php
@@ -114,3 +114,52 @@ function gutenberg_override_default_rest_server() {
 	return 'Gutenberg_REST_Server';
 }
 add_filter( 'wp_rest_server_class', 'gutenberg_override_default_rest_server', 1 );
+
+/**
+ * Adds user avatar URLs to the REST API response for WordPress version 6.7 and below.
+ *
+ * This function is used to add avatar URLs for the author of a post in the REST API response.
+ * It checks if the function 'add_user_avatar_urls_in_rest_response_6_7' does not already exist,
+ * and if not, defines the function.
+ *
+ * @param object $response The REST API response object.
+ * @return object The modified REST API response object with added avatar URLs.
+ */
+if ( ! function_exists( 'add_user_avatar_urls_in_rest_response_6_7' ) && gutenberg_is_experiment_enabled( 'gutenberg-block-comment' ) ) {
+	function add_user_avatar_urls_in_rest_response_6_7( $response ) {
+
+		if ( $response->data['author'] ) {
+			$response->data['author_avatar_urls'] = array(
+				'default' => get_avatar_url( $response->data['author'] ),
+				'48'      => add_query_arg( 's', 48, get_avatar_url( $response->data['author'], array( 'size' => 48 ) ) ),
+				'96'      => add_query_arg( 's', 96, get_avatar_url( $response->data['author'], array( 'size' => 96 ) ) ),
+			);
+		}
+
+		return $response;
+	}
+	add_filter( 'rest_prepare_comment', 'add_user_avatar_urls_in_rest_response_6_7', 10, 1 );
+}
+
+/**
+ * Updates the comment type in the REST API for WordPress version 6.7.
+ *
+ * This function is used as a filter callback for the 'rest_pre_insert_comment' hook.
+ * It checks if the 'comment_type' parameter is set to 'block_comment' in the REST API request,
+ * and if so, updates the 'comment_type' and 'comment_approved' properties of the prepared comment.
+ *
+ * @param array $prepared_comment The prepared comment data.
+ * @param WP_REST_Request $request The REST API request object.
+ * @return array The updated prepared comment data.
+ */
+if ( ! function_exists( 'update_comment_type_in_rest_api_6_7' ) && gutenberg_is_experiment_enabled( 'gutenberg-block-comment' ) ) {
+	function update_comment_type_in_rest_api_6_7( $prepared_comment, $request ) {
+		if ( ! empty( $request['comment_type'] ) && 'block_comment' === $request['comment_type'] ) {
+			$prepared_comment['comment_type']     = $request['comment_type'];
+			$prepared_comment['comment_approved'] = $request['comment_approved'];
+		}
+
+		return $prepared_comment;
+	}
+	add_filter( 'rest_pre_insert_comment', 'update_comment_type_in_rest_api_6_7', 10, 2 );
+}
diff --git a/lib/experimental/editor-settings.php b/lib/experimental/editor-settings.php
index 919be2e6e34a4..9e9f145c67840 100644
--- a/lib/experimental/editor-settings.php
+++ b/lib/experimental/editor-settings.php
@@ -28,6 +28,9 @@ function gutenberg_enable_experiments() {
 	if ( gutenberg_is_experiment_enabled( 'gutenberg-full-page-client-side-navigation' ) ) {
 		wp_add_inline_script( 'wp-block-library', 'window.__experimentalFullPageClientSideNavigation = true', 'before' );
 	}
+	if ( $gutenberg_experiments && array_key_exists( 'gutenberg-block-comment', $gutenberg_experiments ) ) {
+		wp_add_inline_script( 'wp-block-editor', 'window.__experimentalEnableBlockComment = true', 'before' );
+	}
 	if ( $gutenberg_experiments && array_key_exists( 'gutenberg-quick-edit-dataviews', $gutenberg_experiments ) ) {
 		wp_add_inline_script( 'wp-block-editor', 'window.__experimentalQuickEditDataViews = true', 'before' );
 	}
diff --git a/lib/experiments-page.php b/lib/experiments-page.php
index 5acd5f0f19236..094e009d9ca7e 100644
--- a/lib/experiments-page.php
+++ b/lib/experiments-page.php
@@ -163,6 +163,18 @@ function gutenberg_initialize_experiments_settings() {
 		)
 	);
 
+	add_settings_field(
+		'gutenberg-block-comment',
+		__( 'Block Comments', 'gutenberg' ),
+		'gutenberg_display_experiment_field',
+		'gutenberg-experiments',
+		'gutenberg_experiments_section',
+		array(
+			'label' => __( 'Enable multi-user commenting on blocks in post editor', 'gutenberg' ),
+			'id'    => 'gutenberg-block-comment',
+		)
+	);
+
 	add_settings_field(
 		'gutenberg-media-processing',
 		__( 'Client-side media processing', 'gutenberg' ),