| William Hamilton | |
| Full Name: | William Joseph Hamilton |
| Birth Date: | 1 July 1850 |
| University: | Trinity College Dublin |
| Position: | Forward |
| Repyears1: | 1877 |
| Repcaps1: | 1 |
| Reppoints1: | 0 |
William Joseph Hamilton (1 July 1850 — 22 May 1931) was an Irish international rugby union player.
Educated at Trinity College Dublin, Hamilton was a varsity athlete, cricketer and rugby union player, having most success in the latter with a cap for Ireland against England at The Oval in 1877.[1]
Hamilton, a veteran of the Second Boer War, was an honorary major of the 4th Battalion, Royal Irish Fusiliers.[1]
In 1886, Hamilton became the High Sheriff of Cavan, a position once occupied by his father.[2]