diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 000000000..190bc00e3
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,5 @@
+# Core crate ownership.
+/codex-rs/core/ @openai/codex-core-agent-team
+
+# Keep ownership changes reviewed by the same team.
+/.github/CODEOWNERS @openai/codex-core-agent-team