Barding (also spelled bard or barb) is body armour for war horses. The practice of armoring horses was first extensively developed in antiquity in the eastern kingdoms of Parthia and Pahlava. After the conquests of Alexander the Great it likely made its way into European military practices via the Seleucid Empire and later Byzantine Empire. Though its historical roots lie in antiquity in the regions of what was once the Persian Empire, barded horses have become a symbol of the late European Middle Ages chivalry and the era of knights.

During the Late Middle Ages as armour protection for knights became more effective, their mounts became targets. This vulnerability was exploited by the Scots at the Battle of Bannockburn in the 14th century, when horses were killed by the infantry, and by the English at the Battle of Crécy in the same century where long-bowmen shot horses and the then dismounted French knights were killed by heavy infantry. Barding developed as a response to such events.

Examples of armour for horses could be found as far back as classical antiquity. Cataphracts, with scale armour for both rider and horse, are believed by many historians to have influenced the later European knights, via contact with the Byzantine Empire.

The full bard was developed by Lorenz Helmschmied and Konrad Seusenhofer for Maximilian I, who used them extensively for propagandic and aesthetic purposes, as well as diplomatic gifts.

Surviving period examples of barding are rare; however, complete sets are on display at the Philadelphia Museum of Art, the Wallace Collection in London, the Royal Armouries in Leeds, and the Metropolitan Museum of Art in New York. Horse armour could be made in whole or in part of cuir bouilli (hardened leather), but surviving examples of this are especially rare.