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, and can be categorized variously as progressive rock, post-rock, alternative rock, new prog and space rock, experimental rock an others. They also have significant influences and show aspects from other genres such as math rock, indie rock, and shoegaze . Following a twelve-year career, Oceansize announced their split in February 2011, with the members moving on to different projects.