Arthur Whitelock Lemon (15 April 1905 – 28 May 1982) was a Welsh international number 8 who played club rugby for Neath and was capped 13 times for Wales, then later switched codes to play rugby league for St Helens when he found that he had been dropped from the Wales team.
Lemon made his international debut for Wales in a game against Ireland on 9 March 1929 under the captaincy of Guy Morgan.
Lemon played in all four games of the 1931 tournament, which saw Wales win the Championship for the first time in eight years.
When Wales lost the game, the selectors decided on wholesale change and Lemon was amongst 11 players to be dropped.
On being dropped by Wales, Lemon chose to turn professional with St Helens.