diff --git a/src/applications/project/query/PhabricatorProjectSearchEngine.php b/src/applications/project/query/PhabricatorProjectSearchEngine.php
--- a/src/applications/project/query/PhabricatorProjectSearchEngine.php
+++ b/src/applications/project/query/PhabricatorProjectSearchEngine.php
@@ -23,6 +23,14 @@
       id(new PhabricatorSearchTextField())
         ->setLabel(pht('Name'))
         ->setKey('name'),
+      id(new PhabricatorSearchStringListField())
+        ->setLabel(pht('Slugs'))
+        ->setIsHidden(true)
+        ->setKey('slugs')
+        ->setDescription(
+          pht(
+            'Search for projects with particular slugs. (Slugs are the same '.
+            'as project hashtags.)')),
       id(new PhabricatorUsersSearchField())
         ->setLabel(pht('Members'))
         ->setKey('memberPHIDs')
@@ -81,6 +89,10 @@
       $query->withNameTokens($tokens);
     }
 
+    if ($map['slugs']) {
+      $query->withSlugs($map['slugs']);
+    }
+
     if ($map['memberPHIDs']) {
       $query->withMemberPHIDs($map['memberPHIDs']);
     }