The Battle of (the) Trebbia was fought near the rivers of Tidone, Trebbia, and Nure in northern Italy between the joint Russian and Habsburg army under Alexander Suvorov and the Republican French army of Étienne-Jacques-Joseph-Alexandre Macdonald. Though French forces were moderately more numerous, the Austro-Russians severely defeated the French, sustaining about 5,500 casualties while inflicting losses of 16,500 on their enemies. The War of the Second Coalition engagement occurred west of Piacenza, a city located 70 kilometres (43 mi) southeast of Milan.

The Trebbia is a river predominantly of Liguria and Emilia Romagna in northern Italy. It is one of the four main right-bank tributaries of the river Po, the other three being the Tanaro, the Secchia and the Panaro.