diff --git a/RELEASE-NOTES-1.20 b/RELEASE-NOTES-1.20
index 35a3790004f..2df3043dabb 100644
--- a/RELEASE-NOTES-1.20
+++ b/RELEASE-NOTES-1.20
@@ -23,6 +23,8 @@ upgrade PHP if you have not done so prior to upgrading MediaWiki.
 
 === New features in 1.20 ===
 * Added TitleIsAlwaysKnown hook which gets called when determining if a page exists.
+* Added NamespaceIsMovable hook which gets called when determining if pages in a
+  certain namespace can be moved.
 * (bug 32341) Add upload by URL domain limitation.
 * &useskin=default will now always display the default skin. Useful for users with a
   preference for the non-default skin to look at something using the default skin.
diff --git a/docs/hooks.txt b/docs/hooks.txt
index 33db1c53b4b..8d4bdea4e86 100644
--- a/docs/hooks.txt
+++ b/docs/hooks.txt
@@ -1351,6 +1351,11 @@ using this hook.
 	BaseTemplate::makeListItem for details on the format of individual
 	items inside of this array
 
+'NamespaceIsMovable': Called when determining if it is possible to pages in a namespace.
+$index: Integer; the index of the namespace being checked.
+$result: Boolean; whether MediaWiki currently thinks that pages in this namespace are movable.
+Hooks may change this value to override the return value of MWNamespace::isMovable()
+
 'NewRevisionFromEditComplete': called when a revision was inserted
 due to an edit
 $article: the WikiPage edited
diff --git a/includes/Namespace.php b/includes/Namespace.php
index a2751237cc9..c87a12b7c08 100644
--- a/includes/Namespace.php
+++ b/includes/Namespace.php
@@ -65,7 +65,15 @@ class MWNamespace {
 	 */
 	public static function isMovable( $index ) {
 		global $wgAllowImageMoving;
-		return !( $index < NS_MAIN || ( $index == NS_FILE && !$wgAllowImageMoving )  || $index == NS_CATEGORY );
+
+		$result = !( $index < NS_MAIN || ( $index == NS_FILE && !$wgAllowImageMoving )  || $index == NS_CATEGORY );
+
+		/**
+		 * @since 1.20
+		 */
+		wfRunHooks( 'NamespaceIsMovable', array( $index, &$result ) );
+
+		return $result;
 	}
 
 	/**