Fortress is the fourth studio album by American rock band Alter Bridge, released by Roadrunner Records on September 25, 2013. Michael Baskette, who produced Alter Bridge's previous two albums, Blackbird (2007) and AB III (2010), returned as the producer. It was released by Roadrunner Records worldwide except in the United States, where it was self-released on October 8, 2013, through Warner Music, Roadrunner Records passed to be an subsidiary of Warner Music, after EMI disappear a year before. It is their only album since their debut album One Day Remains not to be released in October. The lead single, "Addicted to Pain", was released on August 12, 2013. The album was widely acclaimed, with several critics calling it the band's best album to date and giving praise to each of the band members' musical skills displayed on the record.

Alter Bridge is an American rock band from Orlando, Florida. The band was formed in 2004 by vocalist and rhythm guitarist Myles Kennedy, lead guitarist Mark Tremonti, bassist Brian Marshall and drummer Scott Phillips. After their former band Creed became inactive in 2003, Tremonti and Phillips formed a new band with former bandmate Marshall and new member Kennedy; Alter Bridge was formally unveiled in January 2004, months before Creed's official breakup in June.