Llandyfaelog Fach is a small village and former community, now in the community of Honddu Isaf, in Powys, Wales. It includes the surrounding areas of Glan Honddu, Sarnau, Pwllgloyw and Garthbrengy. These areas border the village. The nearest pubs and shops are in Brecon. Cradoc golf course is also nearby. The civil parish was named "Llandefaelog Fach" and was renamed on 1 April 1974 to become the community of "Llandefailog Fach", the community was abolished on 1 April 1986. At the 1971 census, Llandyfaelog Fach had a population of 108.