diff --git a/src/applications/audit/query/PhabricatorCommitSearchEngine.php b/src/applications/audit/query/PhabricatorCommitSearchEngine.php
--- a/src/applications/audit/query/PhabricatorCommitSearchEngine.php
+++ b/src/applications/audit/query/PhabricatorCommitSearchEngine.php
@@ -49,6 +49,10 @@
       $query->withPackagePHIDs($map['packagePHIDs']);
     }
 
+    if ($map['unreachable'] !== null) {
+      $query->withUnreachable($map['unreachable']);
+    }
+
     return $query;
   }
 
@@ -88,6 +92,17 @@
         ->setConduitKey('packages')
         ->setAliases(array('package', 'packages', 'packagePHID'))
         ->setDatasource(new PhabricatorOwnersPackageDatasource()),
+      id(new PhabricatorSearchThreeStateField())
+        ->setLabel(pht('Unreachable'))
+        ->setKey('unreachable')
+        ->setOptions(
+          pht('(Show All)'),
+          pht('Show Only Unreachable Commits'),
+          pht('Hide Unreachable Commits'))
+        ->setDescription(
+          pht(
+            'Find or exclude unreachable commits which are not ancestors of '.
+            'any branch, tag, or ref.')),
     );
   }
 
@@ -126,7 +141,8 @@
         $query
           ->setParameter('responsiblePHIDs', array($viewer_phid))
           ->setParameter('statuses', $open)
-          ->setParameter('bucket', $bucket_key);
+          ->setParameter('bucket', $bucket_key)
+          ->setParameter('unreachable', false);
         return $query;
       case 'authored':
         $query
diff --git a/src/applications/audit/view/PhabricatorAuditListView.php b/src/applications/audit/view/PhabricatorAuditListView.php
--- a/src/applications/audit/view/PhabricatorAuditListView.php
+++ b/src/applications/audit/view/PhabricatorAuditListView.php
@@ -140,6 +140,7 @@
         ->setObjectName($commit_name)
         ->setHeader($commit_desc)
         ->setHref($commit_link)
+        ->setDisabled($commit->isUnreachable())
         ->addByline(pht('Author: %s', $author_name))
         ->addIcon('none', $committed);
 
diff --git a/src/applications/diffusion/query/DiffusionCommitQuery.php b/src/applications/diffusion/query/DiffusionCommitQuery.php
--- a/src/applications/diffusion/query/DiffusionCommitQuery.php
+++ b/src/applications/diffusion/query/DiffusionCommitQuery.php
@@ -14,6 +14,7 @@
   private $responsiblePHIDs;
   private $statuses;
   private $packagePHIDs;
+  private $unreachable;
 
   private $needAuditRequests;
   private $auditIDs;
@@ -130,6 +131,11 @@
     return $this;
   }
 
+  public function withUnreachable($unreachable) {
+    $this->unreachable = $unreachable;
+    return $this;
+  }
+
   public function withStatuses(array $statuses) {
     $this->statuses = $statuses;
     return $this;
@@ -503,6 +509,21 @@
         $this->packagePHIDs);
     }
 
+    if ($this->unreachable !== null) {
+      if ($this->unreachable) {
+        $where[] = qsprintf(
+          $conn,
+          '(commit.importStatus & %d) = %d',
+          PhabricatorRepositoryCommit::IMPORTED_UNREACHABLE,
+          PhabricatorRepositoryCommit::IMPORTED_UNREACHABLE);
+      } else {
+        $where[] = qsprintf(
+          $conn,
+          '(commit.importStatus & %d) = 0',
+          PhabricatorRepositoryCommit::IMPORTED_UNREACHABLE);
+      }
+    }
+
     return $where;
   }
 
diff --git a/src/applications/diffusion/query/DiffusionCommitRequiredActionResultBucket.php b/src/applications/diffusion/query/DiffusionCommitRequiredActionResultBucket.php
--- a/src/applications/diffusion/query/DiffusionCommitRequiredActionResultBucket.php
+++ b/src/applications/diffusion/query/DiffusionCommitRequiredActionResultBucket.php
@@ -128,6 +128,10 @@
     $should_audit = array_fuse($should_audit);
 
     foreach ($objects as $key => $object) {
+      if (isset($phids[$object->getAuthorPHID()])) {
+        continue;
+      }
+
       if (!$this->hasAuditorsWithStatus($object, $phids, $should_audit)) {
         continue;
       }