The Battle of Sahagún was a cavalry clash at Sahagún, Spain, in which the British 15th Light Dragoons (Hussars) defeated two regiments of French cavalry during the Corunna Campaign of the Peninsular War. Losses to one of the French regiments were so heavy that it was subsequently disbanded. The action marked the final phase of the British army's advance into the interior of Spain, before they began their harrowing retreat to the coast and ultimate evacuation by sea.

The 15th The King's Hussars was a cavalry regiment in the British Army. First raised in 1759, it saw service over two centuries, including the First World War, before being amalgamated with the 19th Royal Hussars into the 15th/19th The King's Royal Hussars in 1922.