William Neilson (18 August 1873 – 16 March 1960) was a Scotland international rugby union player.
He then left to go to Clare College, Cambridge, where he also played rugby for the university before graduating BA in 1894.
[6] Later that year Neilson played for Glasgow in the Inter-City match against Edinburgh District.
One of the four Neilson brothers played in each of the twenty five matches between Willie and George's debut in 1891, until 1899, when Robert had to withdraw from the Calcutta Cup line-up after breaking his nose.
[11] His father was James Neilson, an Ironmaster and second cousin of Walter Montgomerie Neilson and his mother was Jane Thomson, daughter of George Thomson, the famous Glasgow shipbuilder.