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- Henry Kaiser – Comedian now based in New York, New York.
- Tommy Kane – former NFL football player/Seattle Seahawks
- Daniel Kash – actor
- Kenneth Kaushansky – Dean of the Stony Brook University School of Medicine, hematologist, Master of the American College of Physicians
- George Kennedy, owner of Montreal Canadiens hockey team
- Amir Khadir – physician and politician
- Kid Koala – DJ
- Franklin Kiermyer – drummer/composer
- Andy Kim – singer/songwriter
- A. M. Klein – author
- Naomi Klein – author and activist
- Leo Kolber – senator, de facto family member of Bronfman family and Empire.
- Benjamin Kowalewicz – singer of Billy Talent
- David Kristian – Electronic musician
- Sid and Marty Krofft – producers/creators of H.R. Pufnstuf, The Bugaloos, Sigmund and the Sea Monsters, Land of the Lost, The Lost Saucer and so on.
- Joseph Kruger – of Kruger Inc.
Read more about this topic: List Of Montreal Athletes