OK is the fifth studio album by American mathcore band The Fall of Troy, released on April 20, 2016. The album was self-released for free on the band's website, and the first release since their 2009 album, In the Unlikely Event, and the first since their reunion in 2013. In May the same year released OK#2, an alternative and more raw mix of OK, which was also released for free. Two further versions, OK#3.1 and OK#3.2, instrumental versions of both OK and OK#2, respectively, were released for free on their website.