G
- Alfonso Gagliano – politician
- André Gagné – professor and scholar, Concordia University
- Éric Gagné – pitcher/ Los Angeles Dodgers, Texas Rangers
- Marc Gagnon – Olympic Gold Medal speed skater
- Howard Galganov – anglophone rights activist, radio personality
- Céline Galipeau – anchorwoman
- Patsy Gallant – pop singer
- Mitch Garber – international business executive, lawyer, broadcaster
- Arturo Gatti – professional boxer, world champion
- Daniel Gauthier – co-founder of the Cirque du Soleil
- James Gelfand – pianist, composer, arranger
- Yasmeen Ghauri – supermodel
- Ralph Gilles – designer of the Chrysler 300c
- Jessalyn Gilsig – actress
- Hilda Goldblatt Gorenstein (Hilgos) – artist and inspiration for the documentary I Remember Better When I Paint
- Jonathan Goldstein – author, humourist and radio producer
- John Gomery – jurist
- Brian Goodwin – biologist
- Adam Gopnik – writer, essayist
- Huntley Gordon – actor
- Hugh Graham, 1st Baron Atholstan – newspaper publisher
- Stewart Francis Granger – former NBA basketball player
- Howard Grant – former Canadian Olympics and Commonwealth boxer; trainer, UFC welterweight champion Georges St. Pierre
- Otis Grant – former Jamaican born, WBO Middleweight boxing champion
- Harold Greenberg – Movie producer, Founder of Astral Media
- Annie Grenier – AKA "Annie Brocoli" (Children's performer)
- Sylvain Grenier – WWE wrestler
- Irving Grundman – businessman, hockey executive
- Philip Guston – painter and printmaker
Read more about this topic: List Of Montreal Athletes