Orlando Riva Sound (commonly abbreviated as O.R.S.) was a German Euro disco group founded in 1977 by Anthony Monn and Rainer Pietsch.

Their first success was in 1977 with the song "Moon Boots", a mostly instrumental piece. Soon after the group's founding, they added Sophia Reaney as a singer/dancer. The following year, they released "Body to Body Boogie", which was more downtempo compared to "Moon Boots". The song also spawned the album of the same name with the following songs: "Disco Mussorgsky," "Sweet Release" and "Dream Machine", plus the 12" version of "Moon Boots".