Moel y Gaer (Welsh for "bald hill of the fortress") is an Iron Age hillfort at the northern end of the Clwydian Range, located on a summit overlooking the valley of the River Wheeler, near the village of Bodfari, Denbighshire, Wales, five miles north-east of Denbigh.

The hill on which it stands is surrounded by lower land and is strategically situated at the confluence of the River Wheeler and the Clwyd.

The fort at Moel y Gaer is one of the smallest of the chain of defensive works found along the Clwydians.

It probably dates from the Iron Age, although there is no definitive evidence to establish the exact period during which it was occupied.

Various anomalies have been targeted in the excavations, including what is possibly a group of pits and other features where the ground seems to have been dug out, as well as what seems to be a roundhouse on a levelled piece of land.