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- Marc Emery, marijuana activist and libertarian
- The Essentials, a cappella group (current group members Joe Oliva & Janet Turner were born in London)
- Murray Favro, Canadian artist and musician in the Nihilist Spasm Band
- Max Ferguson, CBC radio and TV personality, 1950s and 1960s
- Sam Gagner, NHL forward for the Edmonton Oilers
- The Gandharvas, alternative rock band from the 90's
- Victor Garber, actor
- George Gibson (Mooney), 1880–1967, catcher, Pittsburgh Pirates, won * World Series in 1909; manager in MLB
- Ted Giannoulas, the Famous Chicken / San Diego Chicken mascot
- Ryan Gosling, actor
- Jeff Hackett, former NHL hockey goaltender (ret. 2004)
- Matt Hackett, goaltender prospect of the Minnesota Wild
- Paul Haggis, Academy Award-winning Hollywood screenwriter, director
- Richard B. Harrison (1864–1935), groundbreaking Black actor
- Frank Hawley (b. 1954), two-time World champion drag racing driver
- William C. Heine author, newspaper editor
- Saul Holiff, (1925 - 2005) manager for Johnny Cash from 1960 - 1973
- Mark Hominick (b. 1982),mixed martial artist
- Chris Horodecki (b. 1987), mixed martial artist
- Garth Hudson, keyboard player in The Band
- Tommy Hunter, country singer
- Doug Jarrett, former NHL defenceman (ret. 1976)
- Jenny Jones, TV-talk show host
Read more about this topic: List Of People From London, Ontario