Porcia may refer to:
- Porcia (sister of Cato the Younger) (before 95 BC - 46 BC), sister of Marcus Porcius Cato Uticensis
- Porcia Catonis (70 BC - 43 BC/42 BC), daughter of Marcus Porcius Cato Uticensis, and wife of Marcus Junius Brutus
- Lex Porcia a Roman law
- Porcia, Italy, a commune in Friuli-Venezia Giulia region