Vol. 4 is the fourth studio album by the English heavy metal band Black Sabbath, released on 25 September 1972, by Vertigo Records. It was the first album by Black Sabbath not produced by Rodger Bain; guitarist Tony Iommi assumed production duties. Patrick Meehan, the band's then-manager, was listed as co-producer, though his actual involvement in the album's production was minimal.