No and Hasn't been for years. Like, since the 1970's. He's a solo dude now.
No. He was Ozzy Osbourne's band after Ozzy left black sabbath.
Black Sabbath
Black Sabbath.
The last sabbath album the had Ozzy as the lead singer was Never say die from 1978.
Ozzy was lead singer for the group Black Sabbath.
Black Sabbath
1979
Black Sabbath
Iron Man is on the album Paranoid - Black Sabbath because Ozzy wrote and performed that song originally with Black Sabbath.
The song Iron Man is by Black Sabbath, their singer was Ozzy Osbourne.
Ozzy
If you mean 'Who sings Black Sabbath,' the answer is Black Sabbath. If you mean who sings on it, Ozzy Osbourne. If you mean who sings for Black Sabbath, Ozzy Osbourne then Ronnie James Dio then Ian Gillan then Glenn Hughes then Tony Martin.