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- Peter Kay (born 1973) – Comedian, actor, writer and producer. Born in Farnworth
- Vernon Kay (born 1974) – TV presenter and DJ.
- Jason Kenny (born 1988) – 2008 and 2012 Summer Olympics Track cycling gold medalist. Born in Farnworth.
- Amir Khan (born 1986) – Professional boxer (light-welterweight world champion).
- Thomas Penyngton Kirkman (1806–1895) - Mathematician, FRS
- Andy Knowles (born 1981) – Musician and artist.
- Tony Knowles (born 1955) – snooker player.
- Sir Harold Kroto (born 1939) – Chemist; Nobel Prize winner in 1996 for his work on Buckminsterfullerene. Born in Wisbech, brought up in Bolton.
Read more about this topic: List Of People From Bolton