Oppenheimer were an indie pop band from Belfast, Northern Ireland. The band was made up of musicians Shaun Robinson and Rocky O'Reilly. Robinson and O'Reilly were previously members of the now disbanded Belfast group, Torgas Valley Reds. They met in 2003, in Belfast. O'Reilly had been mixing sound and recording Torgas Valley Reds, whom Robinson drummed for. Inspired by their mutual love for Moog synthesizers, vocoders, and airhorns, O'Reilly and Robinson formed Oppenheimer in late 2004, using O'Reilly's spare room to record 3 songs, which they sent to their favourite labels.

Oppenheimer's music has been used in various North American television shows, including How I Met Your Mother, in the episode "Lucky Penny", Ugly Betty, and Gossip Girl.