Llandysul, also spelt Llandyssul, is a small town and community in the county of Ceredigion, Wales. As a community it consists of the townships of Capel Dewi, Horeb, Pontsian, Pren-gwyn, Tregroes, Rhydowen and the town of Llandysul itself. Llandysul lies in south Ceredigion in the valley of the River Teifi and is visited for its fishing and canoeing. The community had a population of 2732, as of 2011. The village itself has a population of 1484.

Ceredigion ( ), historically Cardiganshire, is a county in the west of Wales. It borders Gwynedd across the Dyfi estuary to the north, Powys to the east, Carmarthenshire and Pembrokeshire to the south, and the Irish Sea to the west. Aberystwyth is the largest settlement and, together with Aberaeron, is an administrative centre of Ceredigion County Council.