The Battle of the Catalaunian Plains (or Fields), also called the Battle of Châlons or the Battle of Maurica, takes place in 451 between a coalition led by the Roman general Flavius Aëtius and the Visigothic king Theodoric I against the Huns and their allies commanded by their leader Attila.

It is one of the last major military operations of the Western Roman Empire, though Visigothic soldiers also form the core of the allied Roman army.

The battle is a strategic victory for the Romans, stopping the Huns' attempt to conquer Roman Gaul.

The Huns are later destroyed by a coalition of Germanic peoples at the Battle of Nedao in 454.