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- Nazem Kadri, NHL center with the Toronto Maple Leafs
- John Kapelos, character actor (frequently featured in John Hughes' films)
- Ingrid Kavelaars, actress
- Kittie, all female heavy metal band
- John Labatt, pioneer brewer
- Sarah Lafleur, actor
- Brett Lindros, former NHL hockey forward, brother of Eric Lindros (ret. 1996)
- Eric Lindros, former NHL forward (ret. 2007), Drafted 1st overall in the 1991 Entry Draft by Quebec, brother of Brett Lindros
- John William Little, businessman and former mayor of London
- Paul Lewis, a much-celebrated African American, born in 1889 and who died in 1974
- Gene Lockhart, actor who appeared in first Blondie and Dagwood films
- Guy Lombardo, world-famous bandleader and hydroplane racer, and his brothers Carmen, Lebert, and Victor
- Donald Luce, former NHL center (ret. 1982)
- Joseph Marks, labour activist and creator of the newspaper the Industrial Banner
- Brad Marsh, former NHL defenceman (ret. 1993)
- Amber Marshall, actress (Amy Fleming from Heartland)
- Vaughn Martin, 2009 Canadian Draft Pick by the NFL's San Diego Chargers
- Masasa Moyo, actress and voice actress
- Rachel McAdams, actress
- Cody McCormick, NHL player with the Buffalo Sabres.
- Roy McDonald, poet, diarist, local street-person/ personality
- Luke Macfarlane, actor
- David McLellan, Olympic freestyle swimmer
- Craig MacTavish, former NHL hockey player (ret. 1997), former Edmonton Oilers head coach (2000–2009).
- Rob McConnell, Canadian Music Hall-of-Fame jazz musician of Boss Brass fame
- Charles Meredith, President of the Montreal Stock Exchange, 1902
- John Walsingham Cooke Meredith J.P., father of the Eight London Merediths
- Chief Justice The Hon. Richard Martin Meredith Q.C., founder of The University of Western Ontario
- Thomas Graves Meredith Q.C., President of Canada Life Assurance Company
- Sir Vincent Meredith 1st Baronet, of Montreal, President of the Bank of Montreal
- Chief Justice Sir William Ralph Meredith Q.C., M.P., Chancellor of the University of Toronto
- Orlo Miller, author
- Scott Moir, ice dancer and 2010 Winter Olympic gold medalist with his partener Tessa Virtue
Read more about this topic: List Of People From London, Ontario