Brutus is a cognomen of the Roman gens Junia, a prominent family of the Roman Republic. The plural of Brutus is Bruti, and the vocative form is Brute, as used in the quotation "Et tu, Brute?" ("you too, Brutus?"), from Shakespeare's play Julius Caesar.
Notable ancient Romans with this cognomen include:
- Lucius Junius Brutus – traditional founder of the Republic, whose sons were:
- Marcus Junius Brutus the Younger – Julius Caesar's friend and most famous assassin
- Marcus Junius Brutus the Elder — father of the aforementioned assassin
- Decimus Junius Brutus Albinus – commander and another one of Caesar's assassins
- Decimus Junius Brutus Callaicus – commander and consul of Hispania Ulterior from 138 BC to 136 BC
- Gaius Junius Bubulcus Brutus – consul from 317 BC
- Lucius Junius Brutus was additionally used as a pseudonym of William Cranch
- Junia (gens)
- Brutus by Cicero, a history of Roman oratory by Cicero, named after Caesar's assassin.
- Brutus of Troy, legendary founder of Britain.
- Brutus Greenshield, Brutus II