diff --git a/arrays_and_strings/pivot_index_array.py b/arrays_and_strings/pivot_index_array.py
new file mode 100644
index 0000000..03c0c42
--- /dev/null
+++ b/arrays_and_strings/pivot_index_array.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
+
+def pivotIndex(nums):
+
+        s = sum(nums)
+
+        left_sum = 0
+
+        for i, x in enumerate(nums):
+
+            if left_sum == (s - left_sum - x):
+                return i
+            
+            left_sum += x
+        
+        return -1