diff --git a/projects/packages/jetpack-mu-wpcom/changelog/add-set-default-category-quick-action b/projects/packages/jetpack-mu-wpcom/changelog/add-set-default-category-quick-action
new file mode 100644
index 0000000000000..562cea91dca9a
--- /dev/null
+++ b/projects/packages/jetpack-mu-wpcom/changelog/add-set-default-category-quick-action
@@ -0,0 +1,4 @@
+Significance: patch
+Type: added
+
+Post categories: Add quick action to change default category
diff --git a/projects/packages/jetpack-mu-wpcom/src/class-jetpack-mu-wpcom.php b/projects/packages/jetpack-mu-wpcom/src/class-jetpack-mu-wpcom.php
index 26cf4192d604a..89597cf7ce895 100644
--- a/projects/packages/jetpack-mu-wpcom/src/class-jetpack-mu-wpcom.php
+++ b/projects/packages/jetpack-mu-wpcom/src/class-jetpack-mu-wpcom.php
@@ -107,6 +107,7 @@ public static function load_features() {
 		require_once __DIR__ . '/features/import-customizations/import-customizations.php';
 		require_once __DIR__ . '/features/marketplace-products-updater/class-marketplace-products-updater.php';
 		require_once __DIR__ . '/features/media/heif-support.php';
+		require_once __DIR__ . '/features/post-categories/quick-actions.php';
 		require_once __DIR__ . '/features/site-editor-dashboard-link/site-editor-dashboard-link.php';
 		require_once __DIR__ . '/features/wpcom-admin-dashboard/wpcom-admin-dashboard.php';
 		require_once __DIR__ . '/features/wpcom-block-editor/class-jetpack-wpcom-block-editor.php';
diff --git a/projects/packages/jetpack-mu-wpcom/src/features/post-categories/quick-actions.php b/projects/packages/jetpack-mu-wpcom/src/features/post-categories/quick-actions.php
new file mode 100644
index 0000000000000..3259f07466dca
--- /dev/null
+++ b/projects/packages/jetpack-mu-wpcom/src/features/post-categories/quick-actions.php
@@ -0,0 +1,87 @@
+<?php
+/**
+ * Quick actions for the categories list page.
+ *
+ * @package automattic/jetpack-mu-wpcom
+ */
+
+/**
+ * Adds a quick action to change the default post category.
+ *
+ * @param string[] $actions An array of action links to be displayed.
+ * @param WP_Term  $category Category object.
+ *
+ * @return string[] Filtered actions.
+ */
+function wpcom_add_set_default_category_quick_action( $actions, $category ) {
+	if ( ! current_user_can( 'manage_options' ) ) {
+		return $actions;
+	}
+
+	$default_category = (int) get_option( 'default_category' );
+	if ( $category->term_id === $default_category ) {
+		return $actions;
+	}
+
+	$action = 'set-default';
+
+	$link = add_query_arg( array( $action => $category->term_id ) );
+	$link = wp_nonce_url( $link, $action . '_' . $category->term_id );
+
+	$actions[ $action ] = sprintf(
+		'<a href="%1$s" aria-label="%2$s">%3$s</a>',
+		esc_url( $link ),
+		/* translators: category name */
+		esc_attr( sprintf( __( 'Set &#8220;%s&#8221; as the default category', 'jetpack-mu-wpcom' ), $category->name ) ),
+		esc_html( __( 'Set as default', 'jetpack-mu-wpcom' ) )
+	);
+	return $actions;
+}
+add_filter( 'category_row_actions', 'wpcom_add_set_default_category_quick_action', 10, 2 );
+
+/**
+ * Changes the default post category.
+ */
+function wpcom_set_default_category() {
+	if ( ! isset( $_GET['taxonomy'] ) || 'category' !== sanitize_text_field( wp_unslash( $_GET['taxonomy'] ) ) ) {
+		return;
+	}
+
+	if ( ! current_user_can( 'manage_options' ) ) {
+		return;
+	}
+
+	$action = 'set-default';
+
+	if ( ! isset( $_GET[ $action ] ) ) {
+		return;
+	}
+
+	$category_id = sanitize_text_field( wp_unslash( $_GET[ $action ] ) );
+	if ( ! is_numeric( $category_id ) ) {
+		return;
+	}
+
+	check_admin_referer( $action . '_' . $category_id );
+
+	$category = get_category( (int) $category_id );
+	if ( is_wp_error( $category ) || ! $category ) {
+		return;
+	}
+
+	update_option( 'default_category', $category->term_id );
+
+	add_action(
+		'admin_notices',
+		function () {
+			wp_admin_notice(
+				__( 'Default category changed successfully.', 'jetpack-mu-wpcom' ),
+				array(
+					'type'        => 'success',
+					'dismissible' => true,
+				)
+			);
+		}
+	);
+}
+add_action( 'load-edit-tags.php', 'wpcom_set_default_category' );