Aber Falls is a waterfall located about two miles south of the village of Abergwyngregyn in Gwynedd. Abergwyngregyn is a village adjacent to where the princes of Wales had a llys, known as Garth Celyn.

The waterfall is formed as the Afon Goch (or the red river) plunges 120 feet (37 m) over a sill of igneous rock in the foothills of the Carneddau range. Two tributaries merge here and the enlarged stream is known as Afon Rhaeadr Fawr. Once past the road bridge, heading towards the village and the mouth of the river, it becomes known as Afon Aber.
A smaller bridge at the foot of the falls is part of the North Wales Path, a long-distance coastal path between Prestatyn and Bangor. Ancient peoples lived in the area, some remains of which are visible to visitors walking along the main footpath towards the falls. These include a Bronze age roundhouse and smithy, standing stones, and cairns.