diff --git a/stubs/WordPress/class-wp-widget.php b/stubs/WordPress/class-wp-widget.php
new file mode 100644
index 0000000..8a057ff
--- /dev/null
+++ b/stubs/WordPress/class-wp-widget.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * @package phan-wordpress-stubs
+ */
+
+/**
+ */
+class WP_Widget {
+	/**
+	 * @param string $id_base
+	 * @param string $name
+	 * @param array  $widget_options {
+	 *     @type string $classname
+	 *     @type string $description
+	 * }
+	 * @param array  $control_options {
+	 *     @type int $height
+	 *     @type int $width
+	 *     @type int|string $id_base
+	 * }
+	 */
+	public function __construct( $id_base, $name, $widget_options = array(), $control_options = array() ) {
+	}
+
+	/**
+	 * @param array $args {
+	 *     @type string after_title
+	 *     @type string after_widget
+	 *     @type string before_title
+	 *     @type string before_widget
+	 *     @type string class
+	 *     @type string description
+	 *     @type string id
+	 *     @type string name
+	 *     @type string widget_id
+	 *     @type string widget_name
+	 * }
+	 * @param array $instance
+	 */
+	public function widget( $args, $instance ) {
+	}
+}
diff --git a/stubs/WordPress/functions.php b/stubs/WordPress/functions.php
index 6b70ba7..902e01e 100644
--- a/stubs/WordPress/functions.php
+++ b/stubs/WordPress/functions.php
@@ -464,6 +464,12 @@ function register_block_type( $name, $args = [] ) {
 function register_setting( $option_group, $option_name, $args = [] ) {
 }
 
+/**
+ * @param string|WP_Widget $widget
+ */
+function register_widget( $widget ) {
+}
+
 /**
  * @param string   $tag
  * @param callable $function_to_remove