La Roux (pronounced /læˈɹu/ in English, French pronunciation: ) is an English electropop duo band made up of singer Eleanor Jackson (born 8 March 1988), and synth player, co-writer and co-producer Ben Langmaid. Jackson describes their respective roles as "very much a half and half sharing situation... not like a singer producer outfit", but also recognizing that it often can "look like a solo act".

Their music is influenced by 1980s synthpop including Yazoo, Depeche Mode, The Human League, Heaven 17, and Blancmange. The band's name originates from Jackson's red hair and French heritage; she has said
To me, it means “red-haired one” – and it does, vaguely. It’s just a male version of “red-haired one”, which I think is even cooler, because I’m well androgynous anyway. So it kind of makes sense.