Police fired tear gas as cars were set on fire and demonstrators threw eggs, paint and stones at parliament buildings.
Italian PM Silvio Berlusconi has narrowly won a vote of confidence in the lower house of parliament by 314 to 311, prompting street protests.
In Rome, violent clashes have left 50 police officers and at least 40 protesters injured.
The marchers set fire to cars, threw stones and overturned bins in Italy’s worst street violence in recent years.
Full story: Silvio Berlusconi vote win sparks Rome clashes