William John Bragg (July 23, 1858 – June 27, 1941) was an Ontario farmer and political figure.

He represented Durham in the Legislative Assembly of Ontario from 1919 to 1937 as a Liberal member.

He was born in Darlington Township, Canada West, the son of Richard Bragg.

Bragg was a director of the Farmer's Dairy of Toronto and of a silver mine.

[1] He died after he was struck and run over by a horse-drawn milk wagon in Toronto, in 1941.