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- Kelley Armstrong, Canadian author (fiction)
- Article One, Christian pop-rock band
- Philip Aziz, painter, sculptor, designer, heritage preservationist
- Karen Dianne Baldwin, Miss Universe 1982
- Frederick Banting, co-discoverer of insulin, practiced in London and has both a museum dedicated to him and a high school named after him
- Joan Barfoot, Canadian author (fiction)
- Joe Bartoch, Olympian swimmer
- Justin Bieber, Canadian pop musician, actor, and singer-songwriter
- John Davis Barnett, 19th-20th century railroad engineer and curator-librarian
- Sir Adam Beck, who was instrumental in setting up the early grid to deliver hydro-electric publicly owned power from Niagara Falls to the rest of Ontario; former mayor of London
- Marc Bell, artist
- Bill Brady, broadcast journalist and media executive, Member of the Order of Canada, former national director of The Canadian Heart & Stroke Foundation.
- Greg Brady, sports radio personality (Sportsnet 590, The Fan)
- Craig Richard Billington Professional Ice Hockey Player for New Jersey Devils, Ottawa Senators, Boston Bruins, Colorado Avalanche, Washington Capitals.
- The Birthday Massacre, synthrock band
- Richard Maurice Bucke, 19th century pioneer in the modern treatment of the mentally ill
Read more about this topic: List Of People From London, Ontario