Barnes & Barnes were an American musical duo, formed in Los Angeles in 1970. Most commonly associated with novelty music and comedy rock, their music also incorporated elements of new wave, synth-pop, and folk rock.

The duo was formed in 1970 by actor Bill Mumy and Robert Haimer (March 2, 1954 – March 4, 2023) who were high school classmates, originally as a private home recording project. By 1978, Barnes & Barnes had gained public recognition with the radio debut of their novelty song "Fish Heads," on the US nationally syndicated Dr. Demento Show.

When recording or performing as Barnes & Barnes, Mumy and Haimer adopt the personae of Art Barnes and Artie Barnes, respectively; twin brothers from the fictional civilization of Lumania, existing in an alternate dimension complete with its own language and customs.