Aqualung is the fourth studio album by the rock band Jethro Tull, released in 1971. It is regarded, despite the band's disagreement, as a concept album featuring a central theme of "the distinction between religion and God". The album's "dour musings on faith and religion" have marked it as "one of the most cerebral albums ever to reach millions of rock listeners". Aqualung's success signalled a turning point in the band's career, which went on to become a major radio and touring act.
The album's original cover art by Burton Silverman.