The 1990 Giro d'Italia of cycling, the 73rd running of the race, was held from 18 May to 6 June 1990. It covered 3,450 km, for a total of 21 stages, and was completed at an average speed of 37.609 km/h.
It was won by the Italian Gianni Bugno, who held the maglia rosa from the first to the last stage (before him, only Girardengo in 1919, Binda in 1927 and Merckx in 1973 achieved the same).