diff --git a/include/s0111_minimum_depth_of_binary_tree.hpp b/include/s0111_minimum_depth_of_binary_tree.hpp
new file mode 100644
index 0000000..1e8e54c
--- /dev/null
+++ b/include/s0111_minimum_depth_of_binary_tree.hpp
@@ -0,0 +1,15 @@
+#ifndef S0111_MINIMUM_DEPTH_OF_BINARY_TREE_HPP
+#define S0111_MINIMUM_DEPTH_OF_BINARY_TREE_HPP
+
+#include <algorithm>
+
+#include "structures.hpp"
+
+using namespace std;
+
+class S0111 {
+ public:
+  int minDepth(TreeNode* root);
+};
+
+#endif
diff --git a/src/s0111_minimum_depth_of_binary_tree.cpp b/src/s0111_minimum_depth_of_binary_tree.cpp
new file mode 100644
index 0000000..8a548d4
--- /dev/null
+++ b/src/s0111_minimum_depth_of_binary_tree.cpp
@@ -0,0 +1,12 @@
+#include "s0111_minimum_depth_of_binary_tree.hpp"
+
+int S0111::minDepth(TreeNode* root) {
+  if (root == nullptr) return 0;
+  if (root->left == nullptr && root->right != nullptr) {
+    return minDepth(root->right) + 1;
+  } else if (root->left != nullptr && root->right == nullptr) {
+    return minDepth(root->left) + 1;
+  } else {
+    return min(minDepth(root->left), minDepth(root->right)) + 1;
+  }
+}