Date of Birth: 
About John William Sinclair
- John William Sinclair (September 3, 1879 - after 1943) was a farmer and politician in Ontario, Canada.
- He represented Bruce in the Legislative Assembly of Ontario from 1934 to 1943 as a Liberal.The son of Duncan Sinclair and Sarah Ann Linn, he was born in Sullivan township, Grey County.
- In 1905, he married the daughter of Robert Neil.
- Sinclair served as reeve or Arran township and was warden for Bruce County in 1924.
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