Llandysul is a small town and community in the county of Ceredigion, Wales. As a community it consists of the townships of Capel Dewi, , Pontsian, Pren-gwyn, Tregroes, Rhydowen and the village 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. Llandysul is also known as the home of Gwasg Gomer, one of the most prominent publishers of Welsh-interest and Welsh language books in Wales. The town is twinned with Plogonnec (Plogoneg) in Brittany, France.