diff --git a/leetcode/21.py b/leetcode/21.py
new file mode 100644
index 0000000..78bbf67
--- /dev/null
+++ b/leetcode/21.py
@@ -0,0 +1,13 @@
+# Merge Two Sorted Lists
+
+# Definition for singly-linked list
+# class ListNode:
+#     def __init__(self, val = 0, next = None):
+#         self.val = val
+#         self.next = next
+
+
+class Solution:
+    def mergeTwoLists(self, list1: list, list2: list):
+        new_list = list1 + list2
+        return new_list.sort()