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- Florence La Badie – actress
- Charline Labonté – hockey player Canadian Olympic women's team, Gold medalists 2006
- Hubert Lacroix – CBC President and CEO
- Dany Laferrière – author
- Guy Lafleur – NHL Hockey Player, Montreal Canadiens
- Jon Lajoie – comedian
- Guy Laliberté – founder and CEO of Cirque de Soleil
- Paul Lambert – left guard Montreal Alouettes
- Phyllis Lambert – architect and member of the Bronfman family.
- Mado Lamotte – drag queen and author
- Jacques Lanctôt – FLQ member, convicted terrorist
- Louise Lanctôt – FLQ member, convicted terrorist
- Pascal Languirand (Trans-X) – electronic music producer
- Jean Lapierre – politician
- Éric Lapointe – CFL running back for the Montreal Alouettes
- Pierre Laporte – politician
- Georges Laraque – NHL hockey player
- Ryan Larkin – animator
- Lisa Lavie – independent singer-songwriter, Internet personality
- Irving Layton – poet, essayist, short story writer
- Jack Layton – politician, Leader of the federal New Democratic Party (NDP)
- Irina Lazareanu – fashion model
- Louise Lecavalier – dancer
- Vincent Lecavalier – NHL player
- Jos LeDuc – professional wrestler
- Ranee Lee – jazz singer
- Sébastien Lefebvre – guitarist of Simple Plan and vocalist
- Jean Leloup – musician
- Mario Lemieux – NHL hockey player
- Vanessa Lengies – actress
- Guy A. Lepage – television personality
- Rene Lepine – real-estate developer
- Chris Leroux – MLB pitcher (Florida Marlins, Pittsburgh Pirates)
- Jean Lesage – lawyer, politician
- Kristopher Letang – QMJHL hockey player, NHL hockey player
- André Éric Létourneau – intermedia artist, composer
- Jean-Louis Lévesque – stockbroker, horse racing builder
- Daniel Levitin – cognitive psychologist, musician, author
- Shawn Levy – director and actor
- William Edmond Logan – geologist
- Colin Low – filmmaker
- Roberto Luongo – NHL goaltender
- Yves A. Lussier – Physician-scientist in translational bioinformatics
Read more about this topic: List Of Montreal Athletes