Oleg Alekseyevich Protopopov (Russian: ???´? ??????´???? ???????´???; born 16 July 1932) is a former Russian pair skater who represented the Soviet Union.
With his wife Ludmila Belousova he is a two-time Olympic champion (1964, 1968) and four-time World champion (1965–1968).
In 1979, the pair defected to Switzerland and became Swiss citizens in 1995.
They continued to skate at ice shows and exhibitions through their seventies.