Fortress is the fourth studio album by the rock band Alter Bridge, released by Roadrunner Records on September 25, 2013. Michael "Elvis" Baskette, who produced Alter Bridge's previous two albums, Blackbird and AB III, returns as producer. It was released by Roadrunner Records worldwide except in the United States, where it was self-released on October 8, 2013, through EMI. The lead single, "Addicted to Pain", was released on August 12, 2013. The album was widely acclaimed, with critics praising its musicianship, lyrics, and experimentation.