A wagon (sometimes spelled 'waggon' in British and Commonwealth English) is a heavy four-wheeled vehicle pulled by draught animals, used for transporting goods, commodities, agricultural materials, supplies, and sometimes people. Wagons are distinguished from carts, which have two wheels, and from lighter four-wheeled vehicles primarily for carrying people, such as carriages.

Wagons are pulled by animals such as horses, mules or oxen. They may be pulled by one animal or by several, often in pairs or teams. A wagon was formerly often called a wain, hence one who builds or repairs wagons is a wainwright.

A person who drives wagons is called a "waggoner", a "teamster", a "bullocky", a "muleskinner", or simply a "driver".