diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000000000..ded7d9df068e0
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,4 @@
+/libcxx/ @llvm/reviewers-libcxx
+/libcxxabi/ @llvm/reviewers-libcxxabi
+/libunwind/ @llvm/reviewers-libunwind
+/runtimes/ @llvm/reviewers-libcxx