Merthyr RFC's first recorded game was in 1876 and was played at the Plymouth Ground at Pentrebach, known as Merthyr Alexandra.


Merthyr RFC is a member of the Welsh Rugby Union, playing in the Principality Premiership, and are a feeder club for the Cardiff Blues.


Its current home is at The Wern in Ynysfach, which recently saw a £1.13m expansion including the construction of a new 700–seater stand, all-weather pitch, floodlights, male and female changing rooms, weight training facilities and a dedicated youth centre.