Index: src/wp-admin/includes/admin-filters.php
===================================================================
--- src/wp-admin/includes/admin-filters.php	(revision 43219)
+++ src/wp-admin/includes/admin-filters.php	(working copy)
@@ -136,6 +136,7 @@
 add_filter( 'wp_privacy_personal_data_erasure_page', 'wp_privacy_process_personal_data_erasure_page', 10, 5 );
 add_filter( 'wp_privacy_personal_data_export_page', 'wp_privacy_process_personal_data_export_page', 10, 7 );
 add_action( 'wp_privacy_personal_data_export_file', 'wp_privacy_generate_personal_data_export_file', 10 );
+add_action( 'wp_privacy_personal_data_erased', '_wp_privacy_send_erasure_fulfillment_notification', 10 );
 
 // Privacy policy text changes check.
 add_action( 'admin_init', array( 'WP_Privacy_Policy_Content', 'text_change_check' ), 20 );
Index: src/wp-admin/includes/user.php
===================================================================
--- src/wp-admin/includes/user.php	(revision 43219)
+++ src/wp-admin/includes/user.php	(working copy)
@@ -981,6 +981,15 @@
 
 	_wp_privacy_completed_request( $request_id );
 
+	/**
+	 * Fires immediately after a personal data erasure request has been marked completed.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @param int $request_id The privacy request post ID associated with this request.
+	 */
+	do_action( 'wp_privacy_personal_data_erased', $request_id );
+
 	return $response;
 }
 
Index: src/wp-includes/user.php
===================================================================
--- src/wp-includes/user.php	(revision 43219)
+++ src/wp-includes/user.php	(working copy)
@@ -2974,7 +2974,7 @@
 	}
 
 	$subject = sprintf(
-		/* translators: %s Site name. */
+	/* translators: %s Site name. */
 		__( '[%s] Action Confirmed' ),
 		wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES )
 	);
@@ -3067,6 +3067,120 @@
 }
 
 /**
+ * Notify the user when their erasure request is fulfilled.
+ *
+ * Without this, the user would never know if their data was actually erased.
+ *
+ * @since 4.9.6
+ *
+ * @param int $request_id The privacy request post ID associated with this request.
+ */
+function _wp_privacy_send_erasure_fulfillment_notification( $request_id ) {
+	$request_data = wp_get_user_request_data( $request_id );
+
+	if ( ! is_a( $request_data, 'WP_User_Request' ) || 'request-completed' !== $request_data->status ) {
+		return;
+	}
+
+	$already_notified = (bool) get_post_meta( $request_id, '_wp_user_notified', true );
+
+	if ( $already_notified ) {
+		return;
+	}
+
+	$subject = sprintf(
+		/* translators: %s Site name. */
+		__( '[%s] Erasure Request Fulfilled' ),
+		wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES )
+	);
+
+	/**
+	 * Filters the recipient of the data erasure fulfillment notification.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @param string          $user_email   The email address of the notification recipient.
+	 * @param WP_User_Request $request_data The request that is initiating the notification.
+	 */
+	$user_email = apply_filters( 'user_erasure_fulfillment_email_to', $request_data->email, $request_data );
+
+	$email_data = array(
+		'request'           => $request_data,
+		'user_email'        => $request_data->email,
+		'privacy_policy_url' => get_privacy_policy_url(),
+		'sitename'          => get_option( 'blogname' ),
+		'siteurl'           => home_url(),
+	);
+
+	if ( empty( $email_data['privacy_policy_url'] ) ) {
+		/* translators: Do not translate SITENAME, SITEURL; those are placeholders. */
+		$email_text = __(
+			'Howdy,
+
+Your request to erase your personal data on ###SITENAME### has been completed.
+
+If you have any follow-up questions or concerns, please contact the site administrator.
+
+Regards,
+All at ###SITENAME###
+###SITEURL###'
+		);
+	} else {
+		/* translators: Do not translate SITENAME, SITEURL, PRIVACY_POLICY_URL; those are placeholders. */
+		$email_text = __(
+			'Howdy,
+
+Your request to erase your personal data on ###SITENAME### has been completed.
+
+If you have any follow-up questions or concerns, please contact the site administrator.
+
+For more information, you can also read our privacy policy: ###PRIVACY_POLICY_URL###
+
+Regards,
+All at ###SITENAME###
+###SITEURL###'
+		);
+	}
+
+	/**
+	 * Filters the body of the data erasure fulfillment notification.
+	 *
+	 * The email is sent to a user when a their data erasure request is fulfilled
+	 * by an administrator.
+	 *
+	 * The following strings have a special meaning and will get replaced dynamically:
+	 *
+	 * ###SITENAME###                The name of the site.
+	 * ###PRIVACY_POLICY_URL## A sentence informing the user of the site's privacy policy page, if one is set.
+	 * ###SITEURL###                 The URL to the site.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @param string $email_text Text in the email.
+	 * @param array  $email_data {
+	 *     Data relating to the account action email.
+	 *
+	 *     @type WP_User_Request $request            User request object.
+	 *     @type string          $user_email         The email address confirming a request
+	 *     @type string          $privacy_policy_url Privacy policy URL.
+	 *     @type string          $sitename           The site name sending the mail.
+	 *     @type string          $siteurl            The site URL sending the mail.
+	 * }
+	 */
+	$content = apply_filters( 'user_confirmed_action_email_content', $email_text, $email_data );
+
+	$content = str_replace( '###SITENAME###', wp_specialchars_decode( $email_data['sitename'], ENT_QUOTES ), $content );
+	$content = str_replace( '###PRIVACY_POLICY_URL###', $email_data['privacy_policy_url'], $content );
+	$content = str_replace( '###SITEURL###', esc_url_raw( $email_data['siteurl'] ), $content );
+
+	$email_sent = wp_mail( $user_email, $subject, $content );
+
+	if ( $email_sent ) {
+		update_post_meta( $request_id, '_wp_user_notified', true );
+	}
+}
+
+/**
  * Return request confirmation message HTML.
  *
  * @since 4.9.6