Retro was the only EP (7") by Ultravox, then Ultravox!, released on February 10, 1978. It was the last recording released by the band as Ultravox!. Also this was the last disc featuring original guitarist Stevie Shears, who left the band after its release.
The EP featured four live tracks recorded in 1977 or early 1978, while Ultravox! were promoting one of their first two albums, Ultravox! and Ha! Ha! Ha!, both released in 1977.
In 2006, Island Records re-released the tracks, adding them to remastered versions of Ultravox!'s albums. The tracks from side two of the EP were included on the reissue of Ultravox! and the side one tracks on the reissue of Ha! Ha! Ha!.