- Iain HarvieDecade started: 1960sGenres: rock music
- Ian AndersonFormed / started: 10 August 1947Note: of Jethro Tull
- Ian BairnsonFormed / started: 3 August 1953Split up / ended: 7 April 2023
- Ian BrownFormed / started: 20 February 1963Note: UK singer, member of Stone Roses
- Ian CurtisFormed / started: 15 July 1956Split up / ended: 18 May 1980
- Ian CussickBorn in: DundeeDecade started: 1950s
- Ian DuryFormed / started: 12 May 1942Split up / ended: 27 March 2000
- Ian HillBorn in: West BromwichDecade started: 1970s
- Ian McCallumBorn in: KentonDecade started: 1960s
- Ian McCullochFormed / started: 5 May 1959Note: Echo & the Bunnymen
- Ian McDonaldFormed / started: 25 June 1946Split up / ended: 9 February 2022
- Ian McLaganBorn in: HounslowDecade started: 1960s
- Ian StewartFormed / started: 18 July 1938Split up / ended: 12 December 1985
- Ian StuartFormed / started: 11 October 1957Split up / ended: 24 September 1993
- Ian WallaceFormed / started: 29 September 1946Split up / ended: 22 February 2007
- Ivor CutlerFormed / started: 15 January 1923Split up / ended: 3 March 2006
- Iwan GriffithsBorn in: CardiffDecade started: 1980s