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
@@ -1594,6 +1594,7 @@
     'PhabricatorCustomFieldNumericIndexStorage' => 'infrastructure/customfield/storage/PhabricatorCustomFieldNumericIndexStorage.php',
     'PhabricatorCustomFieldStorage' => 'infrastructure/customfield/storage/PhabricatorCustomFieldStorage.php',
     'PhabricatorCustomFieldStringIndexStorage' => 'infrastructure/customfield/storage/PhabricatorCustomFieldStringIndexStorage.php',
+    'PhabricatorCustomHeaderConfigType' => 'applications/config/custom/PhabricatorCustomHeaderConfigType.php',
     'PhabricatorDaemon' => 'infrastructure/daemon/PhabricatorDaemon.php',
     'PhabricatorDaemonConsoleController' => 'applications/daemon/controller/PhabricatorDaemonConsoleController.php',
     'PhabricatorDaemonController' => 'applications/daemon/controller/PhabricatorDaemonController.php',
@@ -4853,6 +4854,7 @@
     'PhabricatorCustomFieldNumericIndexStorage' => 'PhabricatorCustomFieldIndexStorage',
     'PhabricatorCustomFieldStorage' => 'PhabricatorLiskDAO',
     'PhabricatorCustomFieldStringIndexStorage' => 'PhabricatorCustomFieldIndexStorage',
+    'PhabricatorCustomHeaderConfigType' => 'PhabricatorConfigOptionType',
     'PhabricatorDaemon' => 'PhutilDaemon',
     'PhabricatorDaemonConsoleController' => 'PhabricatorDaemonController',
     'PhabricatorDaemonController' => 'PhabricatorController',
diff --git a/src/applications/config/custom/PhabricatorCustomHeaderConfigType.php b/src/applications/config/custom/PhabricatorCustomHeaderConfigType.php
new file mode 100644
--- /dev/null
+++ b/src/applications/config/custom/PhabricatorCustomHeaderConfigType.php
@@ -0,0 +1,42 @@
+<?php
+
+final class PhabricatorCustomHeaderConfigType
+  extends PhabricatorConfigOptionType {
+
+  public function validateOption(PhabricatorConfigOption $option, $value) {
+    if (phid_get_type($value) != PhabricatorFileFilePHIDType::TYPECONST) {
+      throw new Exception(pht(
+        '%s is not a valid file phid.', $value));
+    }
+
+    $file = id(new PhabricatorFileQuery())
+      ->setViewer(PhabricatorUser::getOmnipotentUser())
+      ->withPHIDs(array($value))
+      ->executeOne();
+    if (!$file) {
+      throw new Exception(pht(
+        '%s is not a valid file phid.', $value));
+    }
+
+    $most_open_policy = PhabricatorPolicies::getMostOpenPolicy();
+    if ($file->getViewPolicy() != $most_open_policy) {
+      throw new Exception(pht(
+        'Specified file %s has policy "%s" but should have policy "%s".',
+        $value,
+        $file->getViewPolicy(),
+        $most_open_policy));
+    }
+
+    if (!$file->isViewableImage()) {
+      throw new Exception(pht(
+        'Specified file %s is not a viewable image.',
+        $value));
+    }
+  }
+
+  public static function getExampleConfig() {
+    $config = 'PHID-FILE-abcd1234abcd1234abcd';
+    return $config;
+  }
+
+}
diff --git a/src/applications/config/option/PhabricatorCoreConfigOptions.php b/src/applications/config/option/PhabricatorCoreConfigOptions.php
--- a/src/applications/config/option/PhabricatorCoreConfigOptions.php
+++ b/src/applications/config/option/PhabricatorCoreConfigOptions.php
@@ -36,6 +36,8 @@
       'User Guide: Prototype Applications');
     $proto_doc_name = pht('User Guide: Prototype Applications');
     $applications_app_href = '/applications/';
+    $custom_header_example =
+      PhabricatorCustomHeaderConfigType::getExampleConfig();
 
     return array(
       $this->newOption('phabricator.base-uri', 'string', null)
@@ -209,6 +211,27 @@
         ->setLocked(true)
         ->setDescription(
           pht('Custom HTML to show on the main Phabricator dashboard.')),
+      $this->newOption(
+        'ui.custom-header',
+        'custom:PhabricatorCustomHeaderConfigType',
+        null)
+        ->setSummary(
+          pht('Customize the Phabricator logo.'))
+        ->setDescription(
+          pht('You can customize the Phabricator logo by specifying the '.
+              'phid for a viewable image you have uploaded to Phabricator '.
+              'via the [[ /file/ | Files application]]. This image should '.
+              'be:'."\n".
+              ' - 192px X 80px; while not enforced, images with these '.
+              'dimensions will look best across devices.'."\n".
+              ' - have view policy public if [[ '.
+              '/config/edit/policy.allow-public | `policy.allow-public`]] '.
+              'is true and otherwise view policy user; mismatches in these '.
+              'policy settings will result in a broken logo for some users.'.
+              "\n\n".
+              'You should restart your webserver after updating this value '.
+              'to see this change take effect.'))
+        ->addExample($custom_header_example, pht('Valid Config')),
       $this->newOption('phabricator.cache-namespace', 'string', null)
         ->setLocked(true)
         ->setDescription(pht('Cache namespace.')),
diff --git a/src/view/page/menu/PhabricatorMainMenuView.php b/src/view/page/menu/PhabricatorMainMenuView.php
--- a/src/view/page/menu/PhabricatorMainMenuView.php
+++ b/src/view/page/menu/PhabricatorMainMenuView.php
@@ -236,6 +236,29 @@
   }
 
   private function renderPhabricatorLogo() {
+    $style_logo = null;
+    $custom_header = PhabricatorEnv::getEnvConfig('ui.custom-header');
+    if ($custom_header) {
+      $cache = PhabricatorCaches::getImmutableCache();
+      $cache_key_logo = 'ui.custom-header.logo-phid.v1';
+      $logo_uri = $cache->getKey($cache_key_logo);
+      if (!$logo_uri) {
+        $file = id(new PhabricatorFileQuery())
+          ->setViewer($this->getUser())
+          ->withPHIDs(array($custom_header))
+          ->executeOne();
+        if ($file) {
+          $logo_uri = $file->getViewURI();
+          $cache->setKey($cache_key_logo, $logo_uri);
+        }
+      }
+      if ($logo_uri) {
+        $style_logo =
+          'background-size: 96px 40px; '.
+          'background-position: 0px 0px; '.
+          'background-image: url('.$logo_uri.');';
+      }
+    }
 
     return phutil_tag(
       'a',
@@ -260,6 +283,7 @@
           'span',
           array(
             'class' => 'sprite-menu phabricator-main-menu-logo',
+            'style' => $style_logo,
           ),
           ''),
       ));