| Period | Members | Releases |
| November 1979 – February 1981 | Ozzy Osbourne – lead vocals Randy Rhoads – guitar Bob Daisley – bass, backing vocals, percussion Lee Kerslake – drums, percussion Don Airey – keyboards (session) Lindsey Bridgwater – keyboards (touring) | Blizzard of Ozz (1980) Mr Crowley Live EP (1980) Tribute (1987) – two tracks only |
| February – March 1981 | Ozzy Osbourne – lead vocals Randy Rhoads – guitar Bob Daisley – bass, backing vocals Lee Kerslake – drums, percussion Johnny Cook – keyboards (session) | Diary of a Madman (1981) |
| March – December 1981 | Ozzy Osbourne – vocals Randy Rhoads – guitar Rudy Sarzo – bass Tommy Aldridge – drums Lindsey Bridgwater – keyboards (touring) | Tribute (1987) – remaining tracks Ozzy Live (2012) |
| December 1981 – March 1982 | Ozzy Osbourne – vocals Randy Rhoads – guitar Rudy Sarzo – bass Tommy Aldridge – drums Don Airey – keyboards (touring) | none – Diary of a Madman Tour only |
| March – April 1982 | Ozzy Osbourne – vocals Rudy Sarzo – bass Tommy Aldridge – drums Bernie Tormé – guitar Don Airey – keyboards (touring) |
| April – September 1982 | Ozzy Osbourne – vocals Rudy Sarzo – bass Tommy Aldridge – drums Brad Gillis – guitar Don Airey – keyboards (touring) | Speak of the Devil (1982) |
| December 1982 | Ozzy Osbourne – vocals Tommy Aldridge – drums Brad Gillis – guitar Pete Way – bass Lindsey Bridgwater – keyboards (touring) | none – Speak of the Devil Tour only |
| December 1982 – February 1983 | Ozzy Osbourne – lead vocals Tommy Aldridge – drums Jake E. Lee – guitar, backing vocals Don Costa – bass Lindsey Bridgwater – keyboards (touring) |
| February – May 1983 | Ozzy Osbourne – lead vocals Tommy Aldridge – drums Jake E. Lee – guitar, backing vocals Don Costa – bass Don Airey – keyboards (touring) |
| May – September 1983 | Ozzy Osbourne – lead vocals Tommy Aldridge – drums Jake E. Lee – guitar, backing vocals Bob Daisley – bass, backing vocals Don Airey – keyboards | Bark at the Moon (1983) |
| September 1983 – March 1984 | Ozzy Osbourne – lead vocals Jake E. Lee – guitar, backing vocals Bob Daisley – bass, backing vocals Don Airey – keyboards Carmine Appice – drums | none – Bark at the Moon Tour only |
| March 1984 – January 1985 | Ozzy Osbourne – lead vocals Jake E. Lee – guitar, backing vocals Bob Daisley – bass, backing vocals Don Airey – keyboards Tommy Aldridge – drums |
| February – March 1985 | Ozzy Osbourne – lead vocals Jake E. Lee – guitar, backing vocals Bob Daisley – bass, backing vocals Fred Coury – drums | none – studio rehearsals only |
| March – April 1985 | Ozzy Osbourne – lead vocals Jake E. Lee – guitar, backing vocals Bob Daisley – bass, backing vocals Jimmy DeGrasso – drums Mike Moran – keyboards (session) |
| August – late 1985 | Ozzy Osbourne – lead vocals Jake E. Lee – guitar, backing vocals Phil Soussan – bass Randy Castillo – drums Mike Moran – keyboards (session) | The Ultimate Sin (1986) |
| Early 1986 – April 1987 | Ozzy Osbourne – lead vocals Jake E. Lee – guitar, backing vocals Phil Soussan – bass Randy Castillo – drums John Sinclair – keyboards (session/touring) | Ultimate Live Ozzy (1986) |
| May – late 1987 | Ozzy Osbourne – lead vocals Phil Soussan – bass Randy Castillo – drums Zakk Wylde – guitar, backing vocals John Sinclair – keyboards (session/touring) | none – studio rehearsals only |
| Late 1987 – early 1988 | Ozzy Osbourne – lead vocals Randy Castillo – drums Zakk Wylde – guitar, backing vocals Bob Daisley – bass (session) John Sinclair – keyboards (session/touring) | No Rest for the Wicked (1988) |
| May 1988 – August 1989 | Ozzy Osbourne – lead vocals Randy Castillo – drums Zakk Wylde – guitar, backing vocals Geezer Butler – bass John Sinclair – keyboards (session/touring) | Just Say Ozzy (1989) |
| Late 1989 | Ozzy Osbourne – lead vocals Randy Castillo – drums Zakk Wylde – guitar, backing vocals Terry Nails – bass John Sinclair – keyboards (session/touring) | none – studio rehearsals only (demos later released on Prince of Darkness) |
| Late 1989 – October 1991 | Ozzy Osbourne – lead vocals Randy Castillo – drums Zakk Wylde – guitar, backing vocals Mike Inez – bass John Sinclair – keyboards (session/touring) | No More Tears (1991) (featured Bob Daisley in place of Inez on bass) |
| October 1991 – May 1992 | Ozzy Osbourne – lead vocals Randy Castillo – drums Zakk Wylde – guitar, backing vocals Mike Inez – bass Kevin Jones – keyboards (touring) | Live & Loud (1993) |
| May – November 1992 | Ozzy Osbourne – lead vocals Randy Castillo – drums Zakk Wylde – guitar, backing vocals Mike Inez – bass John Sinclair – keyboards (session/touring) | none – No More Tours Tour only |
| Band inactive November 1992 – late 1994 |
| Late 1994 – February 1995 | Ozzy Osbourne – vocals Steve Vai – guitar Bob Daisley – bass Deen Castronovo – drums | none – studio rehearsals only |
| February – May 1995 | Ozzy Osbourne – vocals Deen Castronovo – drums Geezer Butler – bass Zakk Wylde – guitar (session) Rick Wakeman – keyboards (session) | Ozzmosis (1995) |
| May – July 1995 | Ozzy Osbourne – vocals Deen Castronovo – drums Geezer Butler – bass Alex Skolnick – guitar John Sinclair – keyboards (touring) | none – Retirement Sucks Tour only |
| July – September 1995 | Ozzy Osbourne – vocals Deen Castronovo – drums Geezer Butler – bass Joe Holmes – guitar John Sinclair – keyboards (touring) |
| September 1995 – January 1996 | Ozzy Osbourne – vocals Geezer Butler – bass Joe Holmes – guitar Randy Castillo – drums John Sinclair – keyboards (touring) |
| January – March 1996 | Ozzy Osbourne – vocals Joe Holmes – guitar Randy Castillo – drums Mike Inez – bass (touring) John Sinclair – keyboards (touring) |
| March 1996 – October 2000 | Ozzy Osbourne – vocals Joe Holmes – guitar Robert Trujillo – bass Mike Bordin – drums John Sinclair – keyboards (touring) | "Walk on Water" (1996) |
| January – March 1998 (one-off touring lineup) | Ozzy Osbourne – vocals Zakk Wylde – guitar Mike Inez – bass Randy Castillo – drums John Sinclair – keyboards (touring) | none – The Ozzman Cometh Tour only |
| April – May 2000 | Ozzy Osbourne – vocals Joe Holmes – guitar Robert Trujillo – bass Roy Mayorga – drums (touring) John Sinclair – keyboards (touring) | none – Ozzfest tour dates only |
| May – September 2000 | Ozzy Osbourne – vocals Joe Holmes – guitar Robert Trujillo – bass Brian Tichy – drums (touring) John Sinclair – keyboards (touring) |
| September 2000 – January 2001 | Ozzy Osbourne – vocals Joe Holmes – guitar Robert Trujillo – bass Mike Bordin – drums John Sinclair – keyboards (touring) | none – studio rehearsals only |
| January 2001 – March 2003 | Ozzy Osbourne – lead vocals Robert Trujillo – bass Mike Bordin – drums Zakk Wylde – guitar, backing vocals Michael Railo – keyboards (session) John Sinclair – keyboards (touring) | Down to Earth (2001) Live at Budokan (2002) |
| March – December 2003 | Ozzy Osbourne – lead vocals Mike Bordin – drums Zakk Wylde – guitar, backing vocals Jason Newsted – bass Michael St. Claire – keyboards (touring) | none – Ozzfest and other tour dates only |
| December 2003 – July 2004 | Ozzy Osbourne – lead vocals Mike Bordin – drums Zakk Wylde – guitar, backing vocals Rob "Blasko" Nicholson – bass | none – studio rehearsals only |
| July 2004 – July 2009 | Ozzy Osbourne – lead vocals Mike Bordin – drums Zakk Wylde – guitar, keyboards, backing vocals Rob "Blasko" Nicholson – bass Adam Wakeman – keyboards, guitar (touring) | Black Rain (2007) |
| Summer – late 2004 (special recording lineup) | Ozzy Osbourne – vocals Mike Bordin – drums Jerry Cantrell – guitar Chris Wyse – bass | Under Cover (2005) |
| July 2009 – April 2017 | Ozzy Osbourne – lead vocals Rob "Blasko" Nicholson – bass Adam Wakeman – keyboards, rhythm guitar Gus G – lead guitar, backing vocals Tommy Clufetos – drums (initially touring) | Scream (2010) iTunes Festival: London 2010 (2010) |
| April 2017 – early 2019 | Ozzy Osbourne – lead vocals Rob "Blasko" Nicholson – bass Adam Wakeman – keyboards, rhythm guitar Tommy Clufetos – drums Zakk Wylde – lead guitar, backing vocals | none to date – No More Tours II only |
| September – November 2019 (special recording lineup) | Ozzy Osbourne – vocals Andrew Watt – guitar Duff McKagan – bass Chad Smith – drums | Ordinary Man (2020) |
| August 2022 (one off reunion show) | Ozzy Osbourne – vocals Adam Wakeman – bass Tommy Clufetos – drums Tony Iommi – guitar | none – Commonwealth Games closing ceremony |
| September 2022 | Ozzy Osbourne – vocals Tommy Clufetos – drums Zakk Wylde – guitar Andrew Watt – guitar Chris Chaney – bass | none – NFL halftime show |
| July 2025 | Ozzy Osbourne – lead vocals Adam Wakeman – keyboards Tommy Clufetos – drums Zakk Wylde – guitars, backing vocals Mike Inez – bass | none – Back to the Beginning |
