The Battle of Ushant took place on 27 July 1778, and was fought during the American Revolutionary War between French and British fleets 100 miles (160 km) west of Ushant, an island at the mouth of the English Channel off the westernmost point of France. "Ushant" is the anglicised pronunciation of "Ouessant".

The Anglo-French War, also known as the War of 1778 or the Bourbon War in Britain, was a military conflict fought between France and Great Britain, sometimes with their respective allies, between 1778 and 1783. As a consequence, Great Britain was forced to divert resources used to fight the American War of Independence to theatres in Europe, India and the West Indies, and to rely on what turned out to be the chimera of Loyalist support in its North American operations. From 1778 to 1783, with or without their allies, France and Britain fought over dominance in the English Channel, the Mediterranean, the Indian Ocean and the Caribbean.