William Davies (27 December 1890 – 18 September 1967), also known by the nickname of "Avon", was a Welsh dual-code international rugby union, and professional rugby league footballer who played in the 1910s and 1920s. He played representative level rugby union (RU) for Wales, and at club level for Aberavon and Swansea as a centre, and representative level rugby league (RL) for Great Britain and Wales, and at club level for Leeds, as a wing, i.e. number 2 or 5.