Olga Vasilyevna Mostepanova (Russian: Ольга Васильевна Мостепанова; born 3 January 1969) is a retired former Soviet gymnast.

[1] She had a strong senior debut in 1983, winning two gold medals (team, balance beam) and two silvers (all-around, floor exercise) at the 1983 World Championships.

In the all-around, she became the only gymnast in history to earn 10.0 scores on all four events in a major international competition, finishing the session with a perfect mark of 40.0.

In total, Mostepanova earned twelve 10s in Olomouc and left with five of the six possible gold medals: team, all-around, vault, balance beam and floor exercise.

She qualified for the all-around, but she and teammate Irina Baraksanova were pulled from the competition by the team coaches and replaced by Oksana Omelianchik and Elena Shushunova.