Llandysul (Welsh pronunciation: [ɬandɨsɨːl]), also spelt Llandyssul, is a 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.

[3] 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.

Fairs and markets were established by the Kings of England and the Edwardian marcher lords who captured these lands from the native rulers between the 12th and 14th centuries.

Many sheep were reared locally and there were plenty of fast-flowing streams to power machinery so many woollen mills were established in the area in the 19th century.

It is now a thriving printing company and the largest publishing house in Wales and moved to new premises just outside the town in 2004.

The woollen mills are closed and used for other purposes; one housed a confectionery distribution business which is now defunct, and the building currently lies empty.

Tourism draws people into West Wales but Llandysul largely misses out from this source of income as it has no specific tourist attractions.

Telynau Teifi Harps was a community business set up with help from Ceredigion County Council and the European Union in 2004 by harp-maker Allan Shiers.

[8] The business closed in 2022, with its empty building making national news in 2024 as the unexpected base of an illegal cannabis farm containing plants worth a reported £2 million.

[9] Shortly after the operation was shut down by the police, the building caught fire twice, causing major damage to the former primary school.

Llandysul has a post office, two chemists, a range of other shops, a church, several chapels and a leisure centre with swimming pool.

Llandysul Paddlers[11] is a nonprofit making association which works with young people from the community and across the whole of the UK.

Following a community asset transfer in 2017, Llandysul Leisure Centre and the land beneath the swimming pool came into the ownership of the trustees of Calon Tysul.

As well as the swimming pool, the building also includes a sports hall with space for four badminton courts, a multi-purpose room, fitness suite as well as wet and dry changing facilities.

A wide variety of recreational and educational activities take place at the centre, such as swimming, kayaking, children's birthday parties, National Exercise Referral Scheme, fitness classes, gymnastics, badminton, table tennis, climbing, football and more.

Elen, the mother of Owain Glyndwr, the last Welsh Prince of Wales, was celebrated in a large mural placed on the outer wall of Calon Tysul on September 18, 2023.

In October 2014, lightning struck the church tower causing damage to the crenellations in the northeast corner, resulting in chunks of masonry falling on the roof below.