William Joseph Hamilton (1 July 1850 â 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.
Hamilton, a veteran of the Second Boer War, was an honorary major of the 4th Battalion, Royal Irish Fusiliers.
In 1886, Hamilton became the High Sheriff of Cavan, a position once occupied by his father.