Llandybie (Welsh: Llandybïe [ˌɬandəˈbiːɛ] ⓘ, "Saint Tybie's church") is a village and community in Carmarthenshire, Wales, with the village being situated 2 miles (3.2 km) north of Ammanford.

According to the United Kingdom Census 2001, Llandybie village itself is home to a population of 3,800, while the community – which also includes the villages of Blaenau, Caerbryn, Capel Hendre, Cwmgwili, Pentregwenlais, Penybanc, Pen-y-groes, and Saron – has 8,800 inhabitants, increasing to 10,994 at the 2011 census.

[1] It was in Llandybie, in 1943, that the mineral Brammallite was found for the first time.

Llandybie Community Primary School is located in the north-easterly fringe of the village.

The community is bordered by the communities of: Dyffryn Cennen; Cwmamman; Betws; Ammanford; Llanedi; Llannon; Gorslas; and Llanfihangel Aberbythych, all being in Carmarthenshire.