Trebia or Trebbia can refer to:
- The Trebbia River, in Italy
- Trebia (ancient Latin town)
- The Battle of the Trebia, 18 December 218 BC
- The Battle of Trebia (1799)
- Villa del Trebbio, a Tuscan villa
- Trebbiano, a grape
Trebia was an ancient town of Latium in central Italy.
In around 488 BC, Trebia was captured by an invading army of the Volsci, led by Gaius Marcius Coriolanus and Attius Tullus Aufidius.