William Reynolds Bayly (21 May 1867 – 9 November 1937) was an educator in South Australia, headmaster of Prince Alfred College from 1915 to 1929.
[2] W. R. Bayly was educated at Port Adelaide State School when Allen Martin was headmaster, and won a scholarship to study at Prince Alfred College.
In 1909 he was appointed headmaster of Geelong College, where he was known as "Masher Bill", and from 1910 to 1914 did much to improve the school's sporting and scholastic performance, but during a six months' absence overseas his reputation suffered by comparison with the acting head W. T. Price.
[5] He was a member and longtime president of the Adelaide Glee Club, Prince Alfred Old Collegians Association and the South Australian branch of the Royal Society of St George.
[3] He and lifelong friend J. R. Robertson had parallel lives: both won scholarships to PAC while at Port Adelaide School.