| William John Bragg | |
| Office1: | Ontario MPP |
| Term Start1: | 1919 |
| Term End1: | 1937 |
| Predecessor1: | John Henry Devitt |
| Successor1: | Cecil Mercer |
| Constituency1: | Durham Durham West, 1919-1926 |
| Party: | Liberal |
| Birth Date: | 23 July 1858 |
| Birth Place: | Darlington Township, Canada West |
| Death Place: | Toronto, Ontario |
| Occupation: | Farmer |
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. In 1884, he married Sarah Somers. Bragg was a director of the Farmer's Dairy of Toronto and of a silver mine. He was manager for the Bowmanville Fruit Growers Association.[1]
He died after he was struck and run over by a horse-drawn milk wagon in Toronto, in 1941.[2]