diff --git a/src/wp-admin/css/common.css b/src/wp-admin/css/common.css
index cf9c7ffe43..a8c8e612b6 100644
--- a/src/wp-admin/css/common.css
+++ b/src/wp-admin/css/common.css
@@ -560,6 +560,10 @@ code {
 	margin: 10px 20px 0 2px;
 }
 
+.wrap.block-editor-no-js {
+	padding-left: 20px;
+}
+
 .wrap > h2:first-child, /* Back-compat for pre-4.4 */
 .wrap [class$="icon32"] + h2, /* Back-compat for pre-4.4 */
 .postbox .inside h2, /* Back-compat for pre-4.4 */
diff --git a/src/wp-admin/edit-form-blocks.php b/src/wp-admin/edit-form-blocks.php
index 7cf2fa3663..44cfec14a8 100644
--- a/src/wp-admin/edit-form-blocks.php
+++ b/src/wp-admin/edit-form-blocks.php
@@ -23,10 +23,6 @@ if ( ! defined( 'ABSPATH' ) ) {
  */
 global $post_type, $post_type_object, $post, $title, $editor_styles, $wp_meta_boxes;
 
-if ( ! empty( $post_type_object ) ) {
-	$title = $post_type_object->labels->edit_item;
-}
-
 // Flag that we're loading the block editor.
 $current_screen = get_current_screen();
 $current_screen->is_block_editor( true );
@@ -399,9 +395,36 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 ?>
 
 <div class="block-editor">
-	<h1 class="screen-reader-text"><?php echo esc_html( $post_type_object->labels->edit_item ); ?></h1>
-	<div id="editor" class="block-editor__container"></div>
+	<h1 class="screen-reader-text hide-if-no-js"><?php echo esc_html( $title ); ?></h1>
+	<div id="editor" class="block-editor__container hide-if-no-js"></div>
 	<div id="metaboxes" class="hidden">
 		<?php the_block_editor_meta_boxes(); ?>
 	</div>
+
+	<?php // JavaScript is disabled. ?>
+	<div class="wrap hide-if-js block-editor-no-js">
+		<h1 class="wp-heading-inline"><?php echo esc_html( $title ); ?></h1>
+		<div class="notice notice-error notice-alt">
+			<p>
+				<?php
+					$message = sprintf(
+						/* translators: %s: https://wordpress.org/plugins/classic-editor/ */
+						__( 'The block editor requires JavaScript. Please enable JavaScript in your browser settings, or try the <a href="%s">Classic Editor plugin</a>.' ),
+						__( 'https://wordpress.org/plugins/classic-editor/' )
+					);
+
+					/**
+					 * Filters the message displayed in the block editor interface when JavaScript is
+					 * not enabled in the browser.
+					 *
+					 * @since 5.0.3
+					 *
+					 * @param string  $message The message being displayed.
+					 * @param WP_Post $post    The post being edited.
+					 */
+					echo apply_filters( 'block_editor_no_javascript_message', $message, $post );
+					?>
+			</p>
+		</div>
+	</div>
 </div>
diff --git a/src/wp-admin/post.php b/src/wp-admin/post.php
index 8799008664..6f95adc17e 100644
--- a/src/wp-admin/post.php
+++ b/src/wp-admin/post.php
@@ -154,6 +154,8 @@ switch ( $action ) {
 			$post_new_file = "post-new.php?post_type=$post_type";
 		}
 
+		$title = $post_type_object->labels->edit_item;
+
 		/**
 		 * Allows replacement of the editor.
 		 *
@@ -179,8 +181,7 @@ switch ( $action ) {
 			}
 		}
 
-		$title = $post_type_object->labels->edit_item;
-		$post  = get_post( $post_id, OBJECT, 'edit' );
+		$post = get_post( $post_id, OBJECT, 'edit' );
 
 		if ( post_type_supports( $post_type, 'comments' ) ) {
 			wp_enqueue_script( 'admin-comments' );