One Nation Under a Groove is the tenth studio album by American funk and rock band Funkadelic, released on September 22, 1978 on Warner Bros. Records. Recording sessions took place at United Sound Studio in Detroit, Michigan, with one song recorded live on April 15, 1978 at the Monroe Civic Center in Monroe, Louisiana. The album was the first album to include keyboardist and frequent songwriter Walter "Junie" Morrison.
One Nation Under a Groove was Funkadelic's most commercially successful album, and one of its most critically lauded. It is also regarded by many as the greatest funk album of all time and ranks at or near the top of many "best album" lists in disparate genres. The album was later featured on Vibe magazine's 100 Essential Albums of the 20th Century list. In 2003, the album is ranked number 177 on Rolling Stone magazine's list of the 500 greatest albums of all time, maintaining the rating in a 2012 revised list. The album is listed as one of the 1001 Albums You Must Hear Before You Die.