Llanfynydd is a village, parish and community in Carmarthenshire, Wales. The population of the community taken at the 2011 census was 499. It lies some 10 miles north-east of the county town, Carmarthen.
The community is bordered by the communities of: Llansawel; Talley; Manordeilo and Salem; Llangathen; Llanegwad; and Llanfihangel Rhos-y-Corn, all being in Carmarthenshire.
The oldest parts of the current village church (St Egwad's) date from around 1400 with the north aisle added in the 16th century. The previous church was sited further up the valley, the only sign of which is the name of a farm in the area Bryn-Yr-Eglwys (translation "Hill of the Church").
In 1844 Llanfynydd was a parish of 11,000 acres and 1,358 inhabitants in Cathinog Hundred. By 1929 the population was 581.
In July 2004 – in protest over plans to erect a wind farm nearby – the residents of Llanfynydd renamed their village Llanhyfryddawellehynafolybarcudprindanfygythiadtrienusyllafnauole ("lovely silent church, ancient place of the rare kite under wretched threat from misplaced blades") for the space of one week.
The name was chosen to reflect the villagers' concern that the wind farm would threaten three endangered species of bird – the (red kite, the curlew, and the skylark) – and to generate publicity for their cause by being longer than the previously longest placename in the UK: that of Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch in Anglesey.
The protest went ahead despite assurances from the local council and from the Spanish-owned developers Gamesa Energy UK (part of Gamesa Corporación Tecnológica) that the single wind turbine planned was intended merely as a test to see how suitable the area might be for wind turbines in the future.