diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -4056,6 +4056,7 @@
     'PhabricatorProjectColumnHideController' => 'applications/project/controller/PhabricatorProjectColumnHideController.php',
     'PhabricatorProjectColumnNaturalOrder' => 'applications/project/order/PhabricatorProjectColumnNaturalOrder.php',
     'PhabricatorProjectColumnOrder' => 'applications/project/order/PhabricatorProjectColumnOrder.php',
+    'PhabricatorProjectColumnOwnerOrder' => 'applications/project/order/PhabricatorProjectColumnOwnerOrder.php',
     'PhabricatorProjectColumnPHIDType' => 'applications/project/phid/PhabricatorProjectColumnPHIDType.php',
     'PhabricatorProjectColumnPosition' => 'applications/project/storage/PhabricatorProjectColumnPosition.php',
     'PhabricatorProjectColumnPositionQuery' => 'applications/project/query/PhabricatorProjectColumnPositionQuery.php',
@@ -10140,6 +10141,7 @@
     'PhabricatorProjectColumnHideController' => 'PhabricatorProjectBoardController',
     'PhabricatorProjectColumnNaturalOrder' => 'PhabricatorProjectColumnOrder',
     'PhabricatorProjectColumnOrder' => 'Phobject',
+    'PhabricatorProjectColumnOwnerOrder' => 'PhabricatorProjectColumnOrder',
     'PhabricatorProjectColumnPHIDType' => 'PhabricatorPHIDType',
     'PhabricatorProjectColumnPosition' => array(
       'PhabricatorProjectDAO',
diff --git a/src/applications/project/order/PhabricatorProjectColumnOwnerOrder.php b/src/applications/project/order/PhabricatorProjectColumnOwnerOrder.php
new file mode 100644
--- /dev/null
+++ b/src/applications/project/order/PhabricatorProjectColumnOwnerOrder.php
@@ -0,0 +1,163 @@
+<?php
+
+final class PhabricatorProjectColumnOwnerOrder
+  extends PhabricatorProjectColumnOrder {
+
+  const ORDERKEY = 'owner';
+
+  public function getDisplayName() {
+    return pht('Group by Owner');
+  }
+
+  protected function newMenuIconIcon() {
+    return 'fa-users';
+  }
+
+  protected function newHeaderKeyForObject($object) {
+    return $this->newHeaderKeyForOwnerPHID($object->getOwnerPHID());
+  }
+
+  private function newHeaderKeyForOwnerPHID($owner_phid) {
+    if ($owner_phid === null) {
+      $owner_phid = '<null>';
+    }
+
+    return sprintf('owner(%s)', $owner_phid);
+  }
+
+  protected function newSortVectorsForObjects(array $objects) {
+    $owner_phids = mpull($objects, null, 'getOwnerPHID');
+    $owner_phids = array_keys($owner_phids);
+    $owner_phids = array_filter($owner_phids);
+
+    if ($owner_phids) {
+      $owner_users = id(new PhabricatorPeopleQuery())
+        ->setViewer($this->getViewer())
+        ->withPHIDs($owner_phids)
+        ->execute();
+      $owner_users = mpull($owner_users, null, 'getPHID');
+    } else {
+      $owner_users = array();
+    }
+
+    $vectors = array();
+    foreach ($objects as $vector_key => $object) {
+      $owner_phid = $object->getOwnerPHID();
+      if (!$owner_phid) {
+        $vector = $this->newSortVectorForUnowned();
+      } else {
+        $owner = idx($owner_users, $owner_phid);
+        if ($owner) {
+          $vector = $this->newSortVectorForOwner($owner);
+        } else {
+          $vector = $this->newSortVectorForOwnerPHID($owner_phid);
+        }
+      }
+
+      $vectors[$vector_key] = $vector;
+    }
+
+    return $vectors;
+  }
+
+  private function newSortVectorForUnowned() {
+    // Always put unasssigned tasks at the top.
+    return array(
+      0,
+    );
+  }
+
+  private function newSortVectorForOwner(PhabricatorUser $user) {
+    // Put assigned tasks with a valid owner after "Unassigned", but above
+    // assigned tasks with an invalid owner. Sort these tasks by the owner's
+    // username.
+    return array(
+      1,
+      $user->getUsername(),
+    );
+  }
+
+  private function newSortVectorForOwnerPHID($owner_phid) {
+    // If we have tasks with a nonempty owner but can't load the associated
+    // "User" object, move them to the bottom. We can only sort these by the
+    // PHID.
+    return array(
+      2,
+      $owner_phid,
+    );
+  }
+
+  protected function newHeadersForObjects(array $objects) {
+    $owner_phids = mpull($objects, null, 'getOwnerPHID');
+    $owner_phids = array_keys($owner_phids);
+    $owner_phids = array_filter($owner_phids);
+
+    if ($owner_phids) {
+      $owner_users = id(new PhabricatorPeopleQuery())
+        ->setViewer($this->getViewer())
+        ->withPHIDs($owner_phids)
+        ->execute();
+      $owner_users = mpull($owner_users, null, 'getPHID');
+    } else {
+      $owner_users = array();
+    }
+
+    array_unshift($owner_phids, null);
+
+    $headers = array();
+    foreach ($owner_phids as $owner_phid) {
+      $header_key = $this->newHeaderKeyForOwnerPHID($owner_phid);
+
+      if ($owner_phid === null) {
+        $owner = null;
+        $sort_vector = $this->newSortVectorForUnowned();
+        $owner_name = pht('Not Assigned');
+      } else {
+        $owner = idx($owner_users, $owner_phid);
+        if ($owner) {
+          $sort_vector = $this->newSortVectorForOwner($owner);
+          $owner_name = $owner->getUsername();
+        } else {
+          $sort_vector = $this->newSortVectorForOwnerPHID($owner_phid);
+          $owner_name = pht('Unknown User ("%s")', $owner_phid);
+        }
+      }
+
+      $owner_icon = 'fa-user';
+      $owner_color = 'bluegrey';
+
+      $icon_view = id(new PHUIIconView())
+        ->setIcon($owner_icon, $owner_color);
+
+      $header = $this->newHeader()
+        ->setHeaderKey($header_key)
+        ->setSortVector($sort_vector)
+        ->setName($owner_name)
+        ->setIcon($icon_view)
+        ->setEditProperties(
+          array(
+            'value' => $owner_phid,
+          ));
+
+      $headers[] = $header;
+    }
+
+    return $headers;
+  }
+
+  protected function newColumnTransactions($object, array $header) {
+    $new_owner = idx($header, 'value');
+
+    if ($object->getOwnerPHID() === $new_owner) {
+      return null;
+    }
+
+    $xactions = array();
+    $xactions[] = $this->newTransaction($object)
+      ->setTransactionType(ManiphestTaskOwnerTransaction::TRANSACTIONTYPE)
+      ->setNewValue($new_owner);
+
+    return $xactions;
+  }
+
+}