Llandyfaelog Fach (or Llandefaelog Fach) is a small village and community located 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 village has a church dedicated to Saint Maelog. The church contains the Cross of Briamail, known as Croes Briamail [cy] in Welsh.

In the churchyard are the remains of a striking 1816 mausoleum in Egyptian style for the owners of the nearby Penoyre estate. This has largely collapsed recently but previously black lead coffins were visible through its iron barred windows.

• Genuki: Llandyfaelog Fach, Breconshire
• Brecon | Brecon Beacons Cottage Holidays
• Interesting Information for Llandefaelog Fach, Brecon, Wales, LD3 9PP Postcode
• Llandefaelog Fach, St Maelog's Church, History & Visiting Information | Historic Wales Guide
• St. Maelog’s, Llandefaelog Fach – The Benefice of Dan yr Epynt
• [1]