diff --git a/src/applications/project/query/PhabricatorProjectQuery.php b/src/applications/project/query/PhabricatorProjectQuery.php
--- a/src/applications/project/query/PhabricatorProjectQuery.php
+++ b/src/applications/project/query/PhabricatorProjectQuery.php
@@ -6,6 +6,7 @@
   private $ids;
   private $phids;
   private $memberPHIDs;
+  private $nonMemberPHIDs;
   private $slugs;
   private $phrictionSlugs;
   private $names;
@@ -45,6 +46,11 @@
     return $this;
   }
 
+  public function withNonMemberPHIDs(array $phids) {
+    $this->nonMemberPHIDs = $phids;
+    return $this;
+  }
+
   public function withSlugs(array $slugs) {
     $this->slugs = $slugs;
     return $this;
@@ -277,6 +283,13 @@
         $this->memberPHIDs);
     }
 
+    if ($this->nonMemberPHIDs !== null) {
+      $where[] = qsprintf(
+        $conn_r,
+        'e.dst NOT IN(%Ls)',
+        $this->nonMemberPHIDs);
+    }
+
     if ($this->slugs !== null) {
       $slugs = array();
       foreach ($this->slugs as $slug) {
@@ -323,7 +336,7 @@
   }
 
   private function buildGroupClause($conn_r) {
-    if ($this->memberPHIDs || $this->datasourceQuery) {
+    if ($this->memberPHIDs || $this->datasourceQuery || $this->nonMemberPHIDs) {
       return 'GROUP BY p.id';
     } else {
       return $this->buildApplicationSearchGroupClause($conn_r);
@@ -342,7 +355,7 @@
         $this->getViewer()->getPHID());
     }
 
-    if ($this->memberPHIDs !== null) {
+    if ($this->memberPHIDs !== null || $this->nonMemberPHIDs !== null) {
       $joins[] = qsprintf(
         $conn_r,
         'JOIN %T e ON e.src = p.phid AND e.type = %d',
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
@@ -47,6 +47,11 @@
       $query->withMemberPHIDs($member_phids);
     }
 
+    $non_member_phids = $saved->getParameter('nonMemberPHIDs', array());
+    if ($non_member_phids && is_array($non_member_phids)) {
+      $query->withNonMemberPHIDs($non_member_phids);
+    }
+
     $status = $saved->getParameter('status');
     $status = idx($this->getStatusValues(), $status);
     if ($status) {
@@ -151,8 +156,10 @@
     if ($this->requireViewer()->isLoggedIn()) {
       $names['joined'] = pht('Joined');
     }
-
     $names['active'] = pht('Active');
+    if ($this->requireViewer()->isLoggedIn()) {
+      $names['not-joined'] = pht('Not Joined');
+    }
     $names['all'] = pht('All');
 
     return $names;
@@ -170,6 +177,10 @@
       case 'active':
         return $query
           ->setParameter('status', 'active');
+      case 'not-joined':
+        return $query
+          ->setParameter('nonMemberPHIDs', array($viewer_phid))
+          ->setParameter('status', 'active');
       case 'joined':
         return $query
           ->setParameter('memberPHIDs', array($viewer_phid))