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.

The village has a church dedicated to Saint Maelog.

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.