Space Waltz are a New Zealand glam rock band formed in 1974 by frontman Alastair Riddell. In 1974, they had a number-one hit in New Zealand with "Out on the Street".

In 1974, Alastair Riddell (vocals/guitar), Greg Clark (guitar), Eddie Rayner (keyboards), Peter Cuddihy (bass), and Brent Eccles (drums) had been performing as a covers band named Stewart and the Belmonts. Seeking to record Riddell's original compositions, they entered the television talent quest New Faces under the name Space Waltz. In the qualifying round they performed "Out on the Street"; in the finals, "Beautiful Boy", creating a stir with Riddell's "androgynous" image (influenced by David Bowie's Ziggy Stardust).^[1] Although Space Waltz did not win the final, they attracted attention from rock fans and were promptly signed up by EMI Records, who released "Out on the Street" as a single.^[2] The song reached number 1 on the New Zealand charts.^[3][4]

In 1975 the band's debut album was released, entitled Space Waltz by Alastair Riddell, creating some confusion among the public as to whether Space Waltz was a group or a Riddell solo project.^[1] The album, which featured backing vocals by The Yandall Sisters, made the New Zealand Top 20, with the second single, "Fraulein Love", reaching the Top 30.^{[lower-alpha 2]} Space Waltz won Best New Artist at the 1975 Recording Arts Talent Awards.^[7]

The group subsequently flew to Australia but were unable to finalise a record deal there, and disbanded shortly afterwards. Riddell pursued a solo career, Rayner joined Split Enz, and Clark and Eccles joined Citizen Band.

In 2023, the band reunited for the release of a second album, Victory, which featured a blend of new songs together with re-recordings of selected tracks from their first album.^[8]