The Battle of the Colline Gate, fought on 1 November 82 BC, was the decisive battle of the civil war between Lucius Cornelius Sulla and the Marians, Samnites and Lucanians. Sulla won the battle at the northeastern end of Rome, near the Colline Gate, and secured control of Italy. Appian is the only source who provides details about the battle.

The next day Sulla ordered the slaughter of the Marian leaders and Samnite prisoners in the Villa Publica. On 3 November, he started the proscription of his enemies.