diff --git a/src/applications/settings/controller/PhabricatorSettingsTimezoneController.php b/src/applications/settings/controller/PhabricatorSettingsTimezoneController.php
--- a/src/applications/settings/controller/PhabricatorSettingsTimezoneController.php
+++ b/src/applications/settings/controller/PhabricatorSettingsTimezoneController.php
@@ -20,7 +20,8 @@
       $zone = new DateTimeZone($identifier);
       $offset = -($zone->getOffset($now) / 60);
       if ($offset == $client_offset) {
-        $options[$identifier] = $identifier;
+        $name = PhabricatorTime::getTimezoneDisplayName($identifier);
+        $options[$identifier] = $name;
       }
     }
 
diff --git a/src/applications/settings/setting/PhabricatorTimezoneSetting.php b/src/applications/settings/setting/PhabricatorTimezoneSetting.php
--- a/src/applications/settings/setting/PhabricatorTimezoneSetting.php
+++ b/src/applications/settings/setting/PhabricatorTimezoneSetting.php
@@ -81,9 +81,16 @@
       }
 
       sort($group);
+
+      $group_map = array();
+      foreach ($group as $identifier) {
+        $name = PhabricatorTime::getTimezoneDisplayName($identifier);
+        $group_map[$identifier] = $name;
+      }
+
       $option_groups[] = array(
         'label' => $label,
-        'options' => array_fuse($group),
+        'options' => $group_map,
       );
     }
 
diff --git a/src/infrastructure/time/PhabricatorTime.php b/src/infrastructure/time/PhabricatorTime.php
--- a/src/infrastructure/time/PhabricatorTime.php
+++ b/src/infrastructure/time/PhabricatorTime.php
@@ -78,4 +78,14 @@
     return $datetime;
   }
 
+  public static function getTimezoneDisplayName($raw_identifier) {
+
+    // Internal identifiers have names like "America/Los_Angeles", but this is
+    // just an implementation detail and we can render them in a more human
+    // readable format with spaces.
+    $name = str_replace('_', ' ', $raw_identifier);
+
+    return $name;
+  }
+
 }