The Lazio regional election of 1990 took place on 6 and 7 May 1990.
Christian Democracy was by far the largest party, largely ahead of the Italian Communist Party, which placed second. After the election Christian Democrat Rodolfo Gigli formed a government which included the Italian Socialist Party and some minor parties (Pentapartito).
After 1992, following the Tangentopoli scandals, Gigli was succeeded by a succession of governments led by Giorgio Pasetto (Christian Democrat, 1992–1994), Carlo Proietti (Democratic Party of the Left, 1994–1995) and Arturo Osio (Green, 1995).
| Parties | votes | votes (%) | seats | |
|---|---|---|---|---|
| Christian Democracy | 1,123,076 | 34.5 | 22 | |
| Italian Communist Party | 776,485 | 23.8 | 15 | |
| Italian Socialist Party | 464,958 | 14.3 | 9 | |
| Italian Social Movement | 213,174 | 6.5 | 4 | |
| Italian Republican Party | 155,179 | 4.8 | 3 | |
| Green List | 125,460 | 3.9 | 2 | |
| Italian Democratic Socialist Party | 90,300 | 2.8 | 2 | |
| Rainbow Greens | 78,683 | 2.4 | 1 | |
| Antiprohibitionists on Drugs | 58,756 | 1.8 | 1 | |
| Italian Liberal Party | 58,720 | 1.8 | 1 | |
| Proletarian Democracy | 30,165 | 0.9 | align=right | - |
| Pensioners' List | 26,966 | 0.8 | align=right | - |
| Hunting Fishing Environment | 19,735 | 0.6 | align=right | - |
| Pensioners' Alliance | 19,311 | 0.6 | align=right | - |
| Centre League Lazio | 5,872 | 0.2 | align=right | - |
| Motorists | 5,165 | 0.2 | align=right | - |
| Local list | 3,561 | 0.1 | align=right | - |
| Italian National Hunting Movement | 3,492 | 0.1 | align=right | - |
| New People's Party | 1,350 | 0.0 | align=right | - |
| Total | 3,260,408 | 100.0 | 60 | |