diff --git a/src/markup/__tests__/PhutilMarkupTestCase.php b/src/markup/__tests__/PhutilMarkupTestCase.php
--- a/src/markup/__tests__/PhutilMarkupTestCase.php
+++ b/src/markup/__tests__/PhutilMarkupTestCase.php
@@ -76,6 +76,7 @@
       '  http://www.example.org/' => true,
       'ftp://filez.com' => true,
       'mailto:santa@northpole.com' => true,
+      'tel:18005555555' => true,
     );
 
     foreach ($map as $input => $expect) {
diff --git a/src/markup/engine/__tests__/PhutilRemarkupEngineTestCase.php b/src/markup/engine/__tests__/PhutilRemarkupEngineTestCase.php
--- a/src/markup/engine/__tests__/PhutilRemarkupEngineTestCase.php
+++ b/src/markup/engine/__tests__/PhutilRemarkupEngineTestCase.php
@@ -73,6 +73,7 @@
       array(
         'http' => true,
         'mailto' => true,
+        'tel' => true,
       ));
 
     $rules = array();
diff --git a/src/markup/engine/__tests__/remarkup/link-tel.txt b/src/markup/engine/__tests__/remarkup/link-tel.txt
new file mode 100644
--- /dev/null
+++ b/src/markup/engine/__tests__/remarkup/link-tel.txt
@@ -0,0 +1,18 @@
+[[ tel:18005555555 | call me ]]
+
+[ call me ]( tel:18005555555 )
+
+[[tel:18005555555]]
+
+~~~~~~~~~~
+<p><a href="tel:18005555555" class="remarkup-link" target="_blank" rel="noreferrer">call me</a></p>
+
+<p><a href="tel:18005555555" class="remarkup-link" target="_blank" rel="noreferrer">call me</a></p>
+
+<p><a href="tel:18005555555" class="remarkup-link" target="_blank" rel="noreferrer">18005555555</a></p>
+~~~~~~~~~~
+call me <18005555555>
+
+call me <18005555555>
+
+18005555555
diff --git a/src/markup/engine/remarkup/markuprule/PhutilRemarkupDocumentLinkRule.php b/src/markup/engine/remarkup/markuprule/PhutilRemarkupDocumentLinkRule.php
--- a/src/markup/engine/remarkup/markuprule/PhutilRemarkupDocumentLinkRule.php
+++ b/src/markup/engine/remarkup/markuprule/PhutilRemarkupDocumentLinkRule.php
@@ -34,8 +34,8 @@
         $text = $base.$text;
       }
 
-      // If present, strip off "mailto:".
-      $text = preg_replace('/^mailto:/', '', $text);
+      // If present, strip off "mailto:" or "tel:".
+      $text = preg_replace('/^(?:mailto|tel):/', '', $text);
 
       if ($link == $name) {
         return $text;
@@ -50,7 +50,7 @@
       $target = null;
     }
 
-    $name = preg_replace('/^mailto:/', '', $name);
+    $name = preg_replace('/^(?:mailto|tel):/', '', $name);
 
     if ($this->getEngine()->getState('toc')) {
       return $name;
@@ -82,7 +82,8 @@
     }
 
     if (strpos($uri, '/') === false &&
-        strpos($uri, '@') === false) {
+        strpos($uri, '@') === false &&
+        strncmp($uri, 'tel:', 4)) {
       return $matches[0];
     }
 
@@ -99,8 +100,8 @@
     $name = trim(idx($matches, 2, $uri));
 
     // If whatever is being linked to begins with "/" or "#", or has "://",
-    // or is "mailto:", treat it as a URI instead of a wiki page.
-    $is_uri = preg_match('@(^/)|(://)|(^#)|(^mailto:)@', $uri);
+    // or is "mailto:" or "tel:", treat it as a URI instead of a wiki page.
+    $is_uri = preg_match('@(^/)|(://)|(^#)|(^(?:mailto|tel):)@', $uri);
 
     if ($is_uri && strncmp('/', $uri, 1) && strncmp('#', $uri, 1)) {
       $protocols = $this->getEngine()->getConfig(