diff --git a/includes/server-timing/hooks.php b/includes/server-timing/hooks.php
new file mode 100644
index 0000000000..398dad77ae
--- /dev/null
+++ b/includes/server-timing/hooks.php
@@ -0,0 +1,41 @@
+<?php
+/**
+ * Hook callbacks used for Server Timing.
+ *
+ * @package performance-lab
+ *
+ * @since n.e.x.t
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+/**
+ * Adds server timing to REST API response.
+ *
+ * @since n.e.x.t
+ *
+ * @param WP_REST_Response|WP_Error $response Result to send to the client. Usually a `WP_REST_Response`.
+ * @return WP_REST_Response|WP_Error Filtered response.
+ */
+function perflab_rest_post_dispatch_add_server_timing( $response ) {
+	// TODO: Change condition to use wp_is_rest_endpoint() once minimum-supported version is WordPress 6.5.
+	if ( ! defined( 'REST_REQUEST' ) || ! REST_REQUEST || ! $response instanceof WP_REST_Response ) {
+		return $response;
+	}
+
+	$server_timing = perflab_server_timing();
+
+	/** This filter is documented in includes/server-timing/class-perflab-server-timing.php */
+	do_action( 'perflab_server_timing_send_header' );
+
+	$header_value = $server_timing->get_header();
+
+	if ( $header_value ) {
+		$response->header( 'Server-Timing', $header_value, false );
+	}
+
+	return $response;
+}
+add_filter( 'rest_post_dispatch', 'perflab_rest_post_dispatch_add_server_timing', PHP_INT_MAX );
diff --git a/includes/server-timing/load.php b/includes/server-timing/load.php
index 6bbe3756ba..4b2b3bb8c0 100644
--- a/includes/server-timing/load.php
+++ b/includes/server-timing/load.php
@@ -18,6 +18,8 @@
 define( 'PERFLAB_SERVER_TIMING_SETTING', 'perflab_server_timing_settings' );
 define( 'PERFLAB_SERVER_TIMING_SCREEN', 'perflab-server-timing' );
 
+require_once __DIR__ . '/hooks.php';
+
 /**
  * Provides access the Server-Timing API.
  *