Oceansize were an English rock band from Manchester, formed in 1998. The band consisted of Mike Vennart (vocals, guitar), Steve Durose (guitar, backing vocals), Richard “Gambler” Ingram (guitar, keyboards), Mark Heron (drums) and Jon Ellis (bass guitar) for the majority of its career, with Steve Hodson replacing Ellis on bass guitar in 2006.

The band released four studio albums, in addition to a number of minor EPs and singles, displaying a wide array of influences from several genres including post-rock, math rock, psychedelic rock, and space rock. Following a twelve-year career, Oceansize announced their split in February 2011, with the members moving on to different projects.