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The 45th Edition Vuelta a España (Tour of Spain), a long-distance bicyclestage race and one of the three grand tours, was held from 24 April to 15 May 1990. It consisted of 22 stages covering a total of 3,680 km (2,287 mi), and was won by Marco Giovannetti of the Seur cycling team.
Pello Ruiz Cabestany won the opening time trial and took the first leader's jersey. The following day a breakaway got away and Viktor Klimov took the jersey. On the sixth stage a break won the day and took an advantage of over four minutes. Gorospe took the leader's jersey. However, on the eleventh stage, Gorospe had a bad day and lost the jersey to Marco Giovannetti who had been second on the general classification and had been in the break that gained the time on the favourites. Delgado tried to close the gap to Giovannetti over the remainder of the race but could not. Giovannetti won his first and only grand tour ahead of Delgado and Anselmo Fuerte.