Brycheiniog (disambiguation)
Brycheiniog was a small independent petty kingdom in South Wales in the Early Middle Ages. It can also refer to:

Places
Fan Brycheiniog, highest peak in the Black Mountain region of the Brecon Beacons National Park in South Wales 
Theatr Brycheiniog theatre in Brecon 
Bannau Brycheiniog, Welsh name for Brecon Beacons, Wales
Bannau Brycheiniog National Park, alternative name for Brecon Beacons National Park, Wales
Welsh name for Borough of Brecknock, Wales
People
Gwynfardd Brycheiniog (fl. c. 1170-80), Welsh poet
Brychan (or Brychan Brycheiniog), legendary 5th-century king of Brycheiniog 
Other
Brycheiniog (magazine), journal founded in 1955 and published by the Brecknock Society and Museum Friends