William Cross (10 September 1850 - 16 October 1890)[1] was a Scotland international rugby union player.

He is notable for scoring the first conversion in international rugby in 1871 in the match between Scotland and England, after Angus Buchanan got a pushover try.

It was taken was out accordingly, but, instead of putting it down, the Scottish forwards drove the entire scrummage into goal and Angus Buchanan grounded the ball and claimed a try.

This, though illegal according to English laws, was allowed by the umpires and the goal was kicked by Cross.

Arthur knocked on from a line-out and the ball looped over the English defenders, with the quick thinking Cross picking it up for Scotland's second try.