Ozzy Osbourne (1969–1977, 1978–1979, 1997–present)
Also played in: Ozzy Osbourne (solo), Iommi (guest), The Prospectors, The Black Panthers, Approach, Music Machine, Rare Breed.
Tony Iommi (1969–present)
Also played in: Iommi, Heaven And Hell, The In Crowd, The Birds and the Bees, The Rockin’ Chevrolets, The Rest Mythology, Jethro Tull, Ozzy Osbourne
Geezer Butler (1969–1985, 1991–1994, 1997–present)
Also played in: Heaven And Hell,Rare Breed, Ozzy Osbourne.
Bill Ward (1969–1980, 1982–1983, 1984–1985, 1994, 1997–1998, 1999–present)
Also played in: The Rest, Mythology, Iommi.