William Alfred Henry Cotty (24 February 1875 – 6 September 1928) was a South African international rugby union player.

He made his only Test appearance for South Africa during Great Britain's 1896 tour.

He played as a scrum-half in the 3rd Test of the series, a 9–3 loss in Kimberley.

[4] It was Rhodes who had sponsored the raising of this new regiment, the Kimberley Light Horse, in anticipation of conflict with the Boers and shortly prior to the Siege of Kimberley.

The Kimberley regiment is one of only two regiments of the British Empire holding as a Battle Honour the defence of its own city - in this instance Defence of Kimberley.