Aleksandr Potashov (Russian: Александр Поташёв; born March 12, 1962 in Vitebsk, Belarusian SSR) is a retired race walker who represented the USSR and later Belarus. He won the gold medal over 50 kilometres at the 1991 World Championships. Potashov and his teammate Andrey Perlov attempted to cross the goal line simultaneously, resulting in a shared gold medal, but the officials declared Potashov the winner by 0.01 second.
Potashov finished fourth at the 1988 Summer Olympics in Seoul and was disqualified at the 1992 Olympics. His personal best time is 3:40:02, achieved in May 1990.