diff --git a/packages/block-library/src/navigation-submenu/edit.js b/packages/block-library/src/navigation-submenu/edit.js
index acc9510d0d3d30..261b2ad8502fb8 100644
--- a/packages/block-library/src/navigation-submenu/edit.js
+++ b/packages/block-library/src/navigation-submenu/edit.js
@@ -474,6 +474,11 @@ export default function NavigationSubmenuEdit( {
 							}
 						} }
 					/>
+					{ description && (
+						<span className="wp-block-navigation-item__description">
+							{ description }
+						</span>
+					) }
 					{ ! openSubmenusOnClick && isLinkOpen && (
 						<LinkUI
 							clientId={ clientId }
diff --git a/packages/block-library/src/navigation-submenu/index.php b/packages/block-library/src/navigation-submenu/index.php
index d61dbb2426c240..0f560e2849fac2 100644
--- a/packages/block-library/src/navigation-submenu/index.php
+++ b/packages/block-library/src/navigation-submenu/index.php
@@ -159,7 +159,16 @@ function render_block_core_navigation_submenu( $attributes, $content, $block ) {
 		$html .= '>';
 		// End appending HTML attributes to anchor tag.
 
+		$html .= '<span class="wp-block-navigation-item__label">';
 		$html .= $label;
+		$html .= '</span>';
+
+		// Add description if available.
+		if ( ! empty( $attributes['description'] ) ) {
+			$html .= '<span class="wp-block-navigation-item__description">';
+			$html .= wp_kses_post( $attributes['description'] );
+			$html .= '</span>';
+		}
 
 		$html .= '</a>';
 		// End anchor tag content.
@@ -180,6 +189,13 @@ function render_block_core_navigation_submenu( $attributes, $content, $block ) {
 
 		$html .= '</span>';
 
+		// Add description if available.
+		if ( ! empty( $attributes['description'] ) ) {
+			$html .= '<span class="wp-block-navigation-item__description">';
+			$html .= wp_kses_post( $attributes['description'] );
+			$html .= '</span>';
+		}
+
 		$html .= '</button>';
 
 		$html .= '<span class="wp-block-navigation__submenu-icon">' . block_core_navigation_submenu_render_submenu_icon() . '</span>';
diff --git a/packages/block-library/src/navigation/README.md b/packages/block-library/src/navigation/README.md
index b59c4b40d85e73..cbd52a8f21f0ed 100644
--- a/packages/block-library/src/navigation/README.md
+++ b/packages/block-library/src/navigation/README.md
@@ -10,4 +10,5 @@ The structural CSS for the navigation block targets generic classnames across me
 -   `.wp-block-navigation-item` is applied to every menu item.
 -   `.wp-block-navigation-item__content` is applied to the link inside a menu item.
 -   `.wp-block-navigation-item__label` is applied to the innermost container around the menu item text label.
+-   `.wp-block-navigation-item__description` is applied to the innermost container around the menu item description.
 -   `.wp-block-navigation__submenu-icon` is applied to the submenu indicator (chevron).