This article is from the The Osbourne FAQ, by Mike L. with numerous contributions by others.
BAND MEMBER FULL NAME BIRTHDATE
Tony Iommi [guitar] Anthony Frank Iommi Feb 19, 1948 in Aston
Bill Ward [drums] William Ward May 5, 1948 in UK
Ozzy Osbourne [vocals/harmonica] John Michael Osbourne Dec. 3, 1948 in Aston
Geezer Butler [bass] Terence Michael Butler July 17, 1949