- K. K. DowningBorn in: West BromwichDecade started: 1960s
- Karl GreenBorn in: DavyhulmeDecade started: 1960s
- Karl WallingerFormed / started: 19 October 1957Split up / ended: 10 March 2024
- Keef HartleyFormed / started: 8 April 1944Split up / ended: 26 November 2011
- Keith ChristmasFormed / started: 13 October 1946Split up / ended: 9 October 2026
- Keith EmersonFormed / started: 2 November 1944Split up / ended: 10 March 2016
- Keith LeveneFormed / started: 18 July 1957Split up / ended: 11 November 2022
- Keith MoonFormed / started: 23 August 1946Split up / ended: 7 September 1978
- Keith RelfFormed / started: 22 March 1943Split up / ended: 14 May 1976
- Keith RichardsFormed / started: 18 December 1943Note: Rolling Stones guitarist
- Kelly GroucuttFormed / started: 8 September 1945Split up / ended: 19 February 2009
- Kelly GroucuttBorn in: CoseleyDecade started: 1960s
- Kelly JohnsonBorn in: LondonDecade started: 1970s
- Ken BrownBorn in: EnfieldDecade started: 1950s
- Ken CraddockFormed / started: 18 April 1950Split up / ended: 30 May 2002
- Ken HensleyBorn in: PlumsteadDecade started: 1960s
- Ken NicolBorn in: PrestonDecade started: 1970s
- Ken OwenBorn in: BillingeDecade started: 1980s
- Ken WhaleyBorn in: ViennaDecade started: 1960s
- Kenny LynchBorn in: StepneyDecade started: 1960s
- Kenny MorrisFormed / started: 1 February 1957Split up / ended: January 2026
- Kevin AyersFormed / started: 16 August 1944Split up / ended: 18 February 2013
- Kevin CoyneFormed / started: 27 January 1944Split up / ended: 2 December 2004
- Kevin MooneyBorn in: GreenwichDecade started: 1980s
- Kevin RidleyBorn in: NorthumberlandDecade started: 1950s
- Kevin WilkinsonFormed / started: 11 June 1958Split up / ended: 17 July 1999
- Kid BookieDecade started: 2000sGenres: rock music
- Kieron PepperBorn in: EssexDecade started: 1970s
- Kim SimmondsFormed / started: 6 December 1947Split up / ended: 13 December 2022
- Kirby GregoryDecade started: 1960sGenres: rock music
- Kirsty MacCollFormed / started: 10 October 1959Split up / ended: 18 December 2000
- Kit LambertFormed / started: 11 May 1935Split up / ended: 7 April 1981
- KnoxBorn in: CricklewoodDecade started: 1950s