John Henry Matthews IV (August 11, 1888 - July 7, 1956) was the Mayor of Brantford, Ontario, Canada (1946 - 1947),
Known as Jack to his family and friends, he came to Canada in 1909 from the island of Guernsey, he married Florence Honora Jeune in 1910. They had ten children. He was a lithographer/stereotyper with the Brantford Expositor. He served as a city alderman for several years and two years (1946-1947) as mayor. He was involved in the formation of the CCF (Co-operative Commonwealth Federation) that became the NDP (New Democratic Party) in 1961. He ran for election as a CCF candidate but lost his deposit.