| First Team Matches | Associated with both clubs | Transfers |
Formed in 1908, Merthyr became founder members of the Third Division in 1920. They lost their League status in 1931 after failing to gain re-election at the fourth time of asking. They were subsequently replaced by Thames FC and went out of business in 1934. Merthyr Tydfil were formed in 1945.
| Season | Competition | Date | Venue | Results | |
| 1922/23 | FA Cup | 13 January 1923 | Penydarren Park | W | 1-0 |