William James Watt (16 May 1890 â 16 September 1950) was a Welsh international rugby union player.
Watt was born in Llanelly and captained the rugby side at his college (which became Trinity University College). His solitary Wales cap came in a 1914 Five Nations match against England at Twickenham, as a centre.
In World War I, Watt served as a second lieutenant with the South Wales Borderers, suffering serious wounds.
Watt played his club rugby for Llanelly RFC as well as London Welsh over the border, where he had a chartered accountancy practice. He later served London Welsh as club president.