The 1990 Tirreno–Adriatico was the 25th edition of the Tirreno–Adriatico cycle race and was held from 7 March to 14 March 1990. The race started in Bacoli and finished in San Benedetto del Tronto. The race was won by Tony Rominger of the Chateau d'Ax team.
|Dates||7–14 March 1990|
|Distance||1,040.5 km (646.5 mi)|
|Winning time||27h 29' 18"|
|Final general classification|