Moel Oernant is a 503-metre (1,650 ft) high hill in the community of Trawsfynydd in the county of Gwynedd in North Wales.

The hill is formed largely from the mudstones, siltstone and sandstones of the Maentwrog Formation and the siltstones of the underlying Clogau Formation, component units of the Mawddach Group of Cambrian age sedimentary rocks.

An igneous intrusion of microtonalite lies to the west of the summit and the whole hill is cross-cut by dykes of similar material and later dolerite.

Other than parts of its northern slopes the entire hill is mapped as open country under the Countryside and Rights of Way Act 2000 and therefore freely available for public access on foot.

Along its southern and eastern margin is a minor public road beside the Afon Gain.