Sugar Loaf, sometimes called The Sugar Loaf, is a prominent hill in Carmarthenshire, Wales beside the A483 trunk road some four miles (six kilometres) south-west of Llanwrtyd Wells. It is a popular viewpoint and picnic spot within easy reach on foot from the roadside car parks to the northeast and to the south. There is a stop on the nearby Heart of Wales Line called Sugar Loaf railway station.

The name Sugar Loaf has been applied to numerous hills which have a perceived resemblance to a sugarloaf; the nearest is the Sugar Loaf on the border between Powys and Monmouthshire.

• Photos of Sugar Loaf on Geograph website