diff --git a/trees/bt_preorder.py b/trees/bt_preorder.py
new file mode 100644
index 0000000..396e53b
--- /dev/null
+++ b/trees/bt_preorder.py
@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
+def preorder(root) -> list:
+        
+  if root is None:
+      return []
+    
+  return [root.val] + preorder(root.left) + preorder(root.right)
+