diff --git a/wp-admin/includes/ajax-actions.php b/wp-admin/includes/ajax-actions.php
index 15654fbb5b..d265830d24 100644
--- a/wp-admin/includes/ajax-actions.php
+++ b/wp-admin/includes/ajax-actions.php
@@ -103,8 +103,6 @@ function wp_ajax_fetch_list() {
  * @since 3.1.0
  */
 function wp_ajax_ajax_tag_search() {
-	global $wpdb;
-
 	if ( isset( $_GET['tax'] ) ) {
 		$taxonomy = sanitize_key( $_GET['tax'] );
 		$tax = get_taxonomy( $taxonomy );
@@ -894,7 +892,7 @@ function wp_ajax_get_comments( $action ) {
  * @param string $action Action to perform.
  */
 function wp_ajax_replyto_comment( $action ) {
-	global $wp_list_table, $wpdb;
+	global $wp_list_table;
 	if ( empty( $action ) )
 		$action = 'replyto-comment';
 
diff --git a/wp-admin/includes/dashboard.php b/wp-admin/includes/dashboard.php
index 437d2497bc..f930c749f8 100644
--- a/wp-admin/includes/dashboard.php
+++ b/wp-admin/includes/dashboard.php
@@ -761,8 +761,6 @@ function wp_dashboard_recent_posts( $args ) {
  * @return bool False if no comments were found. True otherwise.
  */
 function wp_dashboard_recent_comments( $total_items = 5 ) {
-	global $wpdb;
-
 	// Select all comment types and filter out spam later for better query performance.
 	$comments = array();
 
diff --git a/wp-admin/includes/meta-boxes.php b/wp-admin/includes/meta-boxes.php
index b9f7f63d10..b5bc75be2f 100644
--- a/wp-admin/includes/meta-boxes.php
+++ b/wp-admin/includes/meta-boxes.php
@@ -623,8 +623,6 @@ function post_comment_meta_box_thead($result) {
  * @param object $post
  */
 function post_comment_meta_box( $post ) {
-	global $wpdb;
-
 	wp_nonce_field( 'get-comments', 'add_comment_nonce', false );
 	?>
 	<p class="hide-if-no-js" id="add-new-comment"><a class="button" href="#commentstatusdiv" onclick="window.commentReply && commentReply.addcomment(<?php echo $post->ID; ?>);return false;"><?php _e('Add comment'); ?></a></p>
diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index bda4652390..2ceea9d81f 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -518,8 +518,6 @@ function bulk_edit_posts( $post_data = null ) {
  * @return WP_Post Post object containing all the default post data as attributes
  */
 function get_default_post_to_edit( $post_type = 'post', $create_in_db = false ) {
-	global $wpdb;
-
 	$post_title = '';
 	if ( !empty( $_REQUEST['post_title'] ) )
 		$post_title = esc_html( wp_unslash( $_REQUEST['post_title'] ));
@@ -733,7 +731,6 @@ function write_post() {
  * @return unknown
  */
 function add_meta( $post_ID ) {
-	global $wpdb;
 	$post_ID = (int) $post_ID;
 
 	$metakeyselect = isset($_POST['metakeyselect']) ? wp_unslash( trim( $_POST['metakeyselect'] ) ) : '';
diff --git a/wp-includes/capabilities.php b/wp-includes/capabilities.php
index 198205ad64..42ec2f1fcf 100644
--- a/wp-includes/capabilities.php
+++ b/wp-includes/capabilities.php
@@ -140,7 +140,7 @@ class WP_Roles {
 		if ( ! $this->use_db )
 			return;
 
-		global $wpdb, $wp_user_roles;
+		global $wpdb;
 
 		// Duplicated from _init() to avoid an extra function call.
 		$this->role_key = $wpdb->get_blog_prefix() . 'user_roles';
diff --git a/wp-includes/class-wp-xmlrpc-server.php b/wp-includes/class-wp-xmlrpc-server.php
index d182224fd0..42b879ff61 100644
--- a/wp-includes/class-wp-xmlrpc-server.php
+++ b/wp-includes/class-wp-xmlrpc-server.php
@@ -3190,8 +3190,6 @@ class wp_xmlrpc_server extends IXR_Server {
 	 * @return mixed {@link wp_new_comment()}
 	 */
 	public function wp_newComment($args) {
-		global $wpdb;
-
 		$this->escape($args);
 
 		$blog_id	= (int) $args[0];
diff --git a/wp-includes/general-template.php b/wp-includes/general-template.php
index f7013b208b..c9a9ba9228 100644
--- a/wp-includes/general-template.php
+++ b/wp-includes/general-template.php
@@ -753,7 +753,7 @@ function get_bloginfo( $show = '', $filter = 'raw' ) {
  * @return string|null String on retrieve, null when displaying.
  */
 function wp_title($sep = '&raquo;', $display = true, $seplocation = '') {
-	global $wpdb, $wp_locale;
+	global $wp_locale;
 
 	$m = get_query_var('m');
 	$year = get_query_var('year');
diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index f70f119210..3b72a9cbc7 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -3161,8 +3161,6 @@ function wp_update_term_count( $terms, $taxonomy, $do_deferred=false ) {
  * @return bool Always true when complete.
  */
 function wp_update_term_count_now( $terms, $taxonomy ) {
-	global $wpdb;
-
 	$terms = array_map('intval', $terms);
 
 	$taxonomy = get_taxonomy($taxonomy);