Deep Purple in Rock is the fourth studio album by English rock band Deep Purple, released in June 1970. It was the first studio album recorded by the Mark II line-up of Ian Gillan, Ritchie Blackmore, Roger Glover, Jon Lord and Ian Paice.
The album was the band's breakthrough album in Europe and peaked at No. 4 in the UK, remaining in the charts for months (the band's prior MK I albums had been much better received in the United States and Canada than in their homeland). The album has continued to attract critical praise as a key early example of the hard rock and heavy metal genres.