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
@@ -2454,6 +2454,7 @@
     'PhabricatorHandlePool' => 'applications/phid/handle/pool/PhabricatorHandlePool.php',
     'PhabricatorHandlePoolTestCase' => 'applications/phid/handle/pool/__tests__/PhabricatorHandlePoolTestCase.php',
     'PhabricatorHandleQuery' => 'applications/phid/query/PhabricatorHandleQuery.php',
+    'PhabricatorHandleRemarkupRule' => 'applications/phid/remarkup/PhabricatorHandleRemarkupRule.php',
     'PhabricatorHandlesEditField' => 'applications/transactions/editfield/PhabricatorHandlesEditField.php',
     'PhabricatorHarbormasterApplication' => 'applications/harbormaster/application/PhabricatorHarbormasterApplication.php',
     'PhabricatorHarbormasterConfigOptions' => 'applications/harbormaster/config/PhabricatorHarbormasterConfigOptions.php',
@@ -6897,6 +6898,7 @@
     'PhabricatorHandlePool' => 'Phobject',
     'PhabricatorHandlePoolTestCase' => 'PhabricatorTestCase',
     'PhabricatorHandleQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
+    'PhabricatorHandleRemarkupRule' => 'PhutilRemarkupRule',
     'PhabricatorHandlesEditField' => 'PhabricatorPHIDListEditField',
     'PhabricatorHarbormasterApplication' => 'PhabricatorApplication',
     'PhabricatorHarbormasterConfigOptions' => 'PhabricatorApplicationConfigOptions',
diff --git a/src/applications/phid/remarkup/PhabricatorHandleRemarkupRule.php b/src/applications/phid/remarkup/PhabricatorHandleRemarkupRule.php
new file mode 100644
--- /dev/null
+++ b/src/applications/phid/remarkup/PhabricatorHandleRemarkupRule.php
@@ -0,0 +1,109 @@
+<?php
+
+final class PhabricatorHandleRemarkupRule extends PhutilRemarkupRule {
+
+  const KEY_RULE_HANDLE = 'rule.handle';
+  const KEY_RULE_HANDLE_ORIGINAL = 'rule.handle.original';
+
+  public function apply($text) {
+    return preg_replace_callback(
+      '/{(PHID-[a-zA-Z0-9-]*)}/',
+      array($this, 'markupHandle'),
+      $text);
+  }
+
+  public function markupHandle(array $matches) {
+    $engine = $this->getEngine();
+    $viewer = $engine->getConfig('viewer');
+
+    if (!$this->isFlatText($matches[0])) {
+      return $matches[0];
+    }
+
+    $phid_type = phid_get_type($matches[1]);
+    if ($phid_type == PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN) {
+      return $matches[0];
+    }
+
+    $token = $engine->storeText($matches[0]);
+    if ($engine->isTextMode()) {
+      return $token;
+    }
+
+    $original_key = self::KEY_RULE_HANDLE_ORIGINAL;
+    $original = $engine->getTextMetadata($original_key, array());
+    $original[$token] = $matches[0];
+    $engine->setTextMetadata($original_key, $original);
+
+    $metadata_key = self::KEY_RULE_HANDLE;
+    $metadata = $engine->getTextMetadata($metadata_key, array());
+    $phid = $matches[1];
+    if (empty($metadata[$phid])) {
+      $metadata[$phid] = array();
+    }
+    $metadata[$phid][] = $token;
+    $engine->setTextMetadata($metadata_key, $metadata);
+
+    return $token;
+  }
+
+  public function didMarkupText() {
+    $engine = $this->getEngine();
+
+    $metadata_key = self::KEY_RULE_HANDLE;
+
+    $metadata = $engine->getTextMetadata($metadata_key, array());
+    if (empty($metadata)) {
+      // No mentions, or we already processed them.
+      return;
+    }
+
+    $original_key = self::KEY_RULE_HANDLE_ORIGINAL;
+    $original = $engine->getTextMetadata($original_key, array());
+
+    $phids = array_keys($metadata);
+
+    $handles = id(new PhabricatorHandleQuery())
+      ->setViewer($this->getEngine()->getConfig('viewer'))
+      ->withPHIDs($phids)
+      ->execute();
+
+    foreach ($metadata as $phid => $tokens) {
+      $handle = idx($handles, $phid);
+
+      if ($handle->isComplete()) {
+        if ($engine->isHTMLMailMode()) {
+          $href = $handle->getURI();
+          $href = PhabricatorEnv::getProductionURI($href);
+
+          $link = phutil_tag(
+            'a',
+            array(
+              'href' => $href,
+              'style' => '
+                border-color: #f1f7ff;
+                color: #19558d;
+                background-color: #f1f7ff;
+                border: 1px solid transparent;
+                border-radius: 3px;
+                font-weight: bold;
+                padding: 0 4px;',
+            ),
+            $handle->getLinkName());
+        } else {
+          $link = $handle->renderTag();
+          $link->setPHID($phid);
+        }
+        foreach ($tokens as $token) {
+          $engine->overwriteStoredText($token, $link);
+        }
+      } else {
+        foreach ($tokens as $token) {
+          $engine->overwriteStoredText($token, idx($original, $token));
+        }
+      }
+    }
+
+    $engine->setTextMetadata($metadata_key, array());
+  }
+}
diff --git a/src/infrastructure/markup/PhabricatorMarkupEngine.php b/src/infrastructure/markup/PhabricatorMarkupEngine.php
--- a/src/infrastructure/markup/PhabricatorMarkupEngine.php
+++ b/src/infrastructure/markup/PhabricatorMarkupEngine.php
@@ -494,6 +494,7 @@
 
     $rules[] = new PhabricatorIconRemarkupRule();
     $rules[] = new PhabricatorEmojiRemarkupRule();
+    $rules[] = new PhabricatorHandleRemarkupRule();
 
     $applications = PhabricatorApplication::getAllInstalledApplications();
     foreach ($applications as $application) {