Aberthin is a small village, just outside Cowbridge in the Vale of Glamorgan, South Wales, on the north side of a shallow valley, less than a mile northeast of Cowbridge across the A48 road.

About 250 metres to the south is an old quarry, with a "faulted strip of grey oolite".

[4] As the Nant y Berthyn's confluence (or "Aber" in Welsh) with the River Thaw located just to the west of the village's centre, the name is most likely a contraction of "Aber-Nant-y-Berthyn".

It has no shops, but does have two pubs, a village hall which when built in 1749 was created as Wales's second purpose-built Calvinistic Methodist meeting house,[5] and a notable tree in the middle of the roundabout.

[1] The village hall committee organises many events throughout the year, such as a duck race (where plastic yellow ducks are raced down the stream), a free bonfire and fireworks display (held on the Downs overlooking the village), quiz nights, amateur dramatics, barn dances, and an annual Village Day, which has a barbecue, live music and a dog show.