diff --git a/src/workflow/ArcanistTasksWorkflow.php b/src/workflow/ArcanistTasksWorkflow.php
--- a/src/workflow/ArcanistTasksWorkflow.php
+++ b/src/workflow/ArcanistTasksWorkflow.php
@@ -53,6 +53,11 @@
           'unassigned' => '--owner suppresses unassigned',
         ),
       ),
+      'project' => array(
+        'param' => 'project',
+        'help' => 'Only show tasks associated with the given project,'.
+                  'also accepts project hastags.',
+      ),
       'order' => array(
         'param' => 'task_order',
         'help' =>
@@ -75,6 +80,7 @@
 
     $status     = $this->getArgument('status');
     $owner      = $this->getArgument('owner');
+    $project    = $this->getArgument('project');
     $order      = $this->getArgument('order');
     $limit      = $this->getArgument('limit');
     $unassigned = $this->getArgument('unassigned');
@@ -87,9 +93,16 @@
       $owner_phid = $this->getUserPHID();
     }
 
+    if ($project) {
+      $project_phid = $this->findProjectPHID($project);
+    } else {
+      $project_phid = null;
+    }
+
     $this->tasks = $this->loadManiphestTasks(
       ($status == 'all' ? 'any' : $status),
       $owner_phid,
+      $project_phid,
       $order,
       $limit);
 
@@ -189,7 +202,36 @@
     return idx($user, 'phid');
   }
 
-  private function loadManiphestTasks($status, $owner_phid, $order, $limit) {
+  private function findProjectPHID($project_name) {
+    $conduit = $this->getConduit();
+
+    // Converts "My Project" to slug-equivalent "my_project".
+    $project_slug = str_replace(' ', '_', $project_name);
+    $project_slug = phutil_utf8_strtolower($project_slug);
+
+    $projects = $conduit->callMethodSynchronous(
+      'project.query',
+      array(
+        'slugs' => array($project_slug),
+      ));
+
+    $project = head(head($projects));
+
+    if (!$project) {
+      $error = "Couldn't find project with name or hashtag \"$project_name\".";
+      throw new ArcanistUsageException($error);
+    }
+
+    return idx($project, 'phid');
+  }
+
+  private function loadManiphestTasks(
+    $status,
+    $owner_phid,
+    $project_phid,
+    $order,
+    $limit) {
+
     $conduit = $this->getConduit();
 
     $find_params = array();
@@ -197,6 +239,10 @@
       $find_params['ownerPHIDs'] = array($owner_phid);
     }
 
+    if ($project_phid != null) {
+      $find_params['projectPHIDs'] = array($project_phid);
+    }
+
     if ($limit !== false) {
       $find_params['limit'] = $limit;
     }