The Devil You Know is the only studio album by heavy metal band Heaven & Hell; the members had previously recorded as a group in an earlier line-up of Black Sabbath. The Devil You Know was Ronnie James Dio's final studio album prior to his death in May 2010.

The album's US import was released in Japan on 24 April 2009, four days earlier than its original due date of 28 April. The Japan domestic pressing which is a SHM-CD (Super High Material CD) was released on 27 April. It was produced by the band and sound engineer Mike Exeter.

The Devil You Know debuted at No. 8 on the Billboard 200 chart upon release, with 30,000 copies sold. It was awarded Best Album at the 2010 Metal Hammer Golden Gods Awards.