- Ace FinchumBorn in: IpswichDecade started: 1960s
- Adam AntFormed / started: 3 November 1954Note: English new wave singer and actor
- Adam FaithFormed / started: 23 June 1940Split up / ended: 8 March 2003
- Adam ZindaniBorn in: BirminghamDecade started: 1970s
- AdeleFormed / started: 5 May 1988Note: UK soul/jazz singer
- Adrian BorlandFormed / started: 6 December 1957Split up / ended: 26 April 1999
- Adrian FisherBorn in: DulwichDecade started: 2000s
- Adrian LambertBorn in: BrightonDecade started: 1990s
- Adrian PisarelloBorn in: GibraltarDecade started: 1970s
- Adrian SmithFormed / started: 27 February 1957Note: UK guitarist/songwriter, Iron Maiden
- Adrian SmithBorn in: London Borough of HackneyDecade started: 1970s
- Al AtkinsBorn in: West BromwichDecade started: 1960s
- Al StewartFormed / started: 5 September 1945Note: UK folk singer/songwriter
- Alan BartonBorn in: BarnsleyDecade started: 1950s
- Alan ClarkBorn in: Great LumleyDecade started: 1960s
- Alan HawkshawFormed / started: 27 March 1937Note: British pianist, composer and producer.
- Alan HawkshawBorn in: LeedsDecade started: 1960s
- Alan HullFormed / started: 20 February 1945Split up / ended: 17 November 1995
- Alan LancasterBorn in: LondonDecade started: 1960s
- Alan MooreBorn in: BirminghamDecade started: 1950s
- Alan WarnerDecade started: 1960sGenres: rock music
- Alan WhiteFormed / started: 14 June 1949Split up / ended: 26 May 2022
- Alex HarveyFormed / started: 5 February 1935Split up / ended: 4 February 1982
- Alex LigertwoodFormed / started: 18 December 1946Split up / ended: 30 April 2026
- Alex PennieDecade started: 2000sGenres: rock music
- Alexander YoungFormed / started: 28 December 1938Split up / ended: 4 August 1997
- Alexis KornerFormed / started: 19 April 1928Split up / ended: 1 January 1984
- Algy WardBorn in: CroydonDecade started: 1970s
- Allan HoldsworthFormed / started: 6 August 1946Split up / ended: 15 April 2017
- Ally McErlaineBorn in: GlasgowDecade started: 1980s
- Alonza BevanBorn in: HounslowDecade started: 1980s
- Alvin LeeFormed / started: 19 December 1944Split up / ended: 6 March 2013
- Alvin StardustFormed / started: 27 September 1942Note: English rock singer and stage actor
- Amy MacdonaldFormed / started: 25 August 1987Note: Scottish singer/songwriter
- Andrew BodnarBorn in: LondonDecade started: 1970s
- Andrew LilesFormed / started: 11 March 1969Note: UK sound artist
- Andy HargreavesBorn in: ClitheroeDecade started: 1970s
- Andy JamesFormed / started: 15 May 1981Note: English guitar player
- Andy JohnsFormed / started: 20 May 1950Split up / ended: 7 April 2013
- Andy WhiteFormed / started: 28 May 1962Note: Irish singer-songwriter
- Andy WhiteBorn in: GlasgowDecade started: 1950s
- Andy WickettBorn in: BirminghamDecade started: 1970s
- Angus YoungBorn in: GlasgowDecade started: 1970s
- Annie LennoxFormed / started: 25 December 1954Note: Scottish singer-songwriter, member of Eurythmics and The Tourists
- Anthony DrennanBorn in: LutonDecade started: 1980s
- Anthony LantBorn in: Great BritainDecade started: 1950s
- Anthony PhillipsFormed / started: 23 December 1951Note: Genesis ex‐member/co‐founder, prolific composer for film/TV
- Arno CarstensDecade started: 1990sGenres: rock music
- Art WoodBorn in: West DraytonDecade started: 1960s
- Arthur LouisBorn in: JamaicaDecade started: 1960s