Crystal Castles II is the second studio album by the Canadian electronic music duo Crystal Castles, released on May 24, 2010, by Fiction Records and Last Gang Records. The album was initially scheduled for release on June 7, 2010; however, the release dates were moved forward after the album leaked online, thus a digital version of the album was released on April 23, 2010.
On April 25, 2011, the album was reissued digitally under the title II (stylized as (II)), which replaced the original version of "Not in Love" with the version featuring Robert Smith (of the Cure).