The First Battle of Ushant, July 27, 1778, was a naval battle of the American Revolutionary War, fought between the French and British navies 100 miles west of the isle of Ile d'Ouessant ("Ushant" to the English), a French island at the mouth of the English Channel off the north-westernmost point of France.

The British had 30 ships of the line commanded by Admiral the Honorable Augustus Keppel in HMS Victory. The French had 29 ships commanded by Admiral the Comte d'Orvilliers . The two fleets manoeuvered during shifting winds and a heavy rain squall until a battle became inevitable with the British more or less in column and the French in some confusion. However, the French managed to pass along the British line to windward with their most advanced ships. At about a quarter to twelve HMS Victory opened fire on Bretagne, 110, followed by Ville de Paris , 90. The British van escaped with little loss but Sir Hugh Palliser 's rear division suffered considerably. Keppel made the signal to wear and follow the French but Palliser did not conform and the action was not resumed. Keppel was court-martialled and cleared and Palliser criticised by an enquiry before the affair turned into a squabble of party politics.