diff --git a/clang/.clang-format-ignore b/clang/.clang-format-ignore
new file mode 100644
index 000000000000..1fb0c9558af8
--- /dev/null
+++ b/clang/.clang-format-ignore
@@ -0,0 +1,3 @@
+# Do not attempt to format .td files; we have too many formatting needs across
+# the various files to allow automatic formatting.
+**/*.td