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.
[3] In the 1963 provincial election, he ran as the Knox served as the Progressive Conservative candidate in the riding of Lambton West.
[5] 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 1,092 votes.