Alessandro Aimar (born 5 June 1967 in Milan) is a retired Italian sprinter who specialized in the 400 metres.
He won six medals at the International athletics competitions, all of these with national relays team. His personal best time is 45.76 seconds, achieved in July 1993 in Sestriere. He participated at two editions of the Summer Olympics (1992 and 1996), he has 30 caps in national team from 1989 to 1997.