Llangeinor (Welsh: Llangeinwyr) is a small village located in the Garw Valley around 5 miles north of Bridgend in Bridgend County Borough, Wales. The ward population taken at the 2011 census was 1,243. The entire village is now protected as part of a conservation area.
The A4064 road runs through the village; to the south this leads to Tondu, and to the north it heads to Pontycymer. The A4093 road starts in the village and heads east over the mountain to the Ogmore Valley. A disused railway runs through the village.
IRVIN-GQ, part of Airborne Systems Group, makes parachutes for the military, near the junction of the A4093 with the main road A4064. GQ Parachutes had been formed in 1932.
Llangeinor was the home of Richard Price, an internationally influential academic with a notable contribution to the development of free market economics, as well as the mathematical subject of bayesian probability, having edited and published Thomas Bayes work.