diff --git a/lib/experimental/overlay-patterns.php b/lib/experimental/overlay-patterns.php
new file mode 100644
index 00000000000000..0cfb4cbab84d1c
--- /dev/null
+++ b/lib/experimental/overlay-patterns.php
@@ -0,0 +1,46 @@
+<?php
+/**
+ * Block patterns registration for navigation overlays.
+ *
+ * @package gutenberg
+ */
+
+/**
+ * Registers block patterns for navigation overlays.
+ *
+ * This function adds patterns that are specific to the navigation overlays
+ * experiment. It runs after core patterns are registered to ensure all patterns
+ * are available.
+ *
+ * @since 6.0.0
+ */
+function gutenberg_register_overlay_block_patterns() {
+	register_block_pattern_category(
+		'navigation',
+		array(
+			'label'       => _x( 'Navigation', 'Block pattern category', 'gutenberg' ),
+			'description' => _x( 'Display your website navigation.', 'Block pattern category', 'gutenberg' ),
+		)
+	);
+
+	register_block_pattern(
+		'gutenberg/navigation-overlay',
+		array(
+			'title'       => __( 'Navigation Overlay', 'gutenberg' ),
+			'description' => _x( 'A simple pattern with a navigation block and a navigation overlay close button.', 'Block pattern description', 'gutenberg' ),
+			'content'     => '<!-- wp:group {"style":{"spacing":{"padding":{"right":"var:preset|spacing|40","left":"var:preset|spacing|40","top":"var:preset|spacing|40","bottom":"var:preset|spacing|40"}}},"layout":{"type":"default"}} -->
+<div class="wp-block-group" style="padding-top:var(--wp--preset--spacing--40);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40)"><!-- wp:group {"align":"wide","layout":{"type":"flex","flexWrap":"nowrap","justifyContent":"right"}} -->
+<div class="wp-block-group alignwide"><!-- wp:navigation-overlay-close -->
+<button class="wp-block-navigation-overlay-close" type="button" aria-label="Close"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24" aria-hidden="true" focusable="false"><path d="M13 11.8l6.1-6.3-1.1-1-6.1 6.2-6.1-6.2-1.1 1 6.1 6.3-6.5 6.7 1.1 1 6.5-6.6 6.5 6.6 1.1-1z"></path></svg></button>
+<!-- /wp:navigation-overlay-close --></div>
+<!-- /wp:group -->
+
+<!-- wp:navigation {"layout":{"type":"flex","orientation":"vertical"}} /--></div>
+<!-- /wp:group -->',
+			'categories'  => array( 'navigation' ),
+			'blockTypes'  => array( 'core/template-part/overlay' ),
+		)
+	);
+}
+
+add_action( 'init', 'gutenberg_register_overlay_block_patterns', 20 );
diff --git a/lib/load.php b/lib/load.php
index 7eb1dfb78a86a0..5ed2a09a1c1357 100644
--- a/lib/load.php
+++ b/lib/load.php
@@ -211,3 +211,8 @@ function gutenberg_is_experiment_enabled( $name ) {
 	require __DIR__ . '/experimental/interactivity-api/class-gutenberg-interactivity-api-full-page-navigation.php';
 	Gutenberg_Interactivity_API_Full_Page_Navigation::instance();
 }
+
+// Block patterns (only load when navigation overlays experiment is enabled).
+if ( gutenberg_is_experiment_enabled( 'gutenberg-customizable-navigation-overlays' ) ) {
+	require __DIR__ . '/experimental/overlay-patterns.php';
+}