diff --git a/src/my_project/interviews/google_top_exercises/round_1/20_lowest_common_ancestor_of_binary_tree.py b/src/my_project/interviews/google_top_exercises/round_1/20_lowest_common_ancestor_of_binary_tree.py
new file mode 100644
index 00000000..1b8ca656
--- /dev/null
+++ b/src/my_project/interviews/google_top_exercises/round_1/20_lowest_common_ancestor_of_binary_tree.py
@@ -0,0 +1,27 @@
+class TreeNode:
+    def __init__(self, x):
+        self.val = x
+        self.left = None
+        self.right = None
+
+class Solution:
+    def lowestCommonAncestor(self, root:TreeNode, p, q):
+        """
+        :type root: TreeNode
+        :type p: TreeNode
+        :type q: TreeNode
+        :rtype: TreeNode
+        """
+
+        if not root: 
+            return 
+        elif root.val == p.val or root.val == q.val:
+            return root
+        
+        l = self.lowestCommonAncestor(root.left,p,q)
+        r = self.lowestCommonAncestor(root.right,p,q)
+
+        if l and r: 
+            return root 
+        else:
+            return l or r
\ No newline at end of file