Marco Giovannetti (born 4 April 1962) is an Italian former professional road bicycle racer and Olympic gold medalist who won the Vuelta a España in 1990. He has also won stages at the Tour de Suisse and the Giro d'Italia.
Giovannetti was born in Milan, Italy to a Tuscan family. Early in his career as an amateur, Giovannetti won the gold medal in the Team Road Race at the 1984 Summer Olympics in Los Angeles, California, together with Claudio Vandelli, Marcello Bartalini and Eros Poli.
Giovannetti's overall win in the 1990 Vuelta a España was due to a decisive attack on stage 6 over the Las Palomas mountain range. Although he placed fifth on the stage, his competitors fared worse and Giovannetti moved into second place and by stage 11 he had moved into the lead and eventually defeating the defending champion Pedro Delgado, who finished in second place. He became only the fourth Italian to win the Spanish Grand Tour.
In 1991, Giovannetti finished all three Grand Tours in a single season.