| Glyn Allen | |
| Full Name: | Gerald Glyn Allen |
| Birth Date: | 14 March 1874 |
| Death Place: | Liverpool, England |
| Position: | Halfback |
| Repyears1: | 1896–99 |
| Repcaps1: | 9 |
| Reppoints1: | 3 |
Gerald Glyn Allen (14 March 1874 — 4 January 1949) was an Irish international rugby union player.
Allen, a native of Derry, was the elder brother of Ireland forward Charles Elliot Allen.[1]
Educated in Scotland, Allen learned his rugby at Merchiston Castle School.[2]
Allen played in English rugby for Liverpool and was a Lancashire representative player. He was capped nine times as a halfback for Ireland, forming a partnership with Louis Magee, which helped secure the triple crown in 1899.[3]