|Preceded by||Bryan Cathcart|
|Succeeded by||Riding abolished|
|Born||January 1, 1905|
Asphodel Township, Ontario
|Died||March 24, 1981 (aged 76)|
Lambton County, Ontario
|Political party||Progressive Conservative|
John Ralph Knox (January 1, 1905 – March 24, 1981) was a politician in Ontario, Canada. He was a Progressive Conservative member of the Legislative Assembly of Ontario from 1963 to 1967 who represented the southwestern riding of Lambton West.
Knox was born in Asphodel Township, Ontario. He was a teacher in the Lambton County public school system and, from 1952 to the time of his election, in 1963, he was the Principal of Devine Street Public School in Sarnia. He died in 1981. He married his wife, Eva Lillian Knox, on 24 September, 1928 and he is buried, with his wife, at Lakeview Cemetery, Lambton County, Ontario.
Knox was elected to Sarnia city council in the late 1950s and served for eight years. In the 1963 provincial election, he ran as the Knox served as the Progressive Conservative candidate in the riding of Lambton West. He defeated Liberal candidate William Rogers by 683 votes. He served as a backbench supporter government led by Premier John Robarts. In the 1967 election he ran in the newly redistributed riding of Sarnia but was defeated by Liberal Jim Bullbrook by 1,073 votes.
- Pierre G. Normandin; A. Léopold Normandin (2007-10-03). "Guide Parlementaire Canadien". Retrieved 2016-09-02 – via Google Books.
- "List of Principals, Devine Street Public School". Archived from the original on July 20, 2014.
- "J. Ralph Knox". The Globe and Mail. March 25, 1981. p. P2.
- "Photo of gravesite". Cemetery Project. 2013.
- Canadian Press (September 26, 1963). "78 in Tory Blue Wave -- 23 Is All Grits Saved". The Windsor Star. Windsor, Ontario. p. 25.
- Canadian Press (October 18, 1967). "Tories win, but..." The Windsor Star. Windsor, Ontario. p. B2.