John Ralston (born October 9, 1964) is a Canadian actor.

Career
Ralston's most notable roles are George Venturi on Life with Derek, and his role as Mr. Avenir on Strange Days at Blake Holsey High. He was also the lead on the 2010–12 HBO Canada series Living in Your Car.

Earlier in his career, Ralston was seen on the Toronto stage in a production of George F. Walker's Risk Everything in 1998.

In 2006 and 2007, he was featured in Toyota Tundra truck commercials airing in Canada, and starred as Ming the Merciless in the 2007 Sci-Fi Channel original series Flash Gordon. In 2008 he was in the Lifetime movie A Near Death Experience.

In July 2013, Ralston appeared on Degrassi in its 13th season as Miles Hollingsworth II, a role he continued through its 14th and final season. Ralston reprised this role in the follow-up series, Degrassi: Next Class. In 2015, he co-starred as Jean-Claude Van Damme's estranged brother in the film, Pound of Flesh.