The Fourth Anglo-Dutch War (Dutch: Vierde Engels-Nederlandse Oorlog; 1780–1784) was a conflict between the Kingdom of Great Britain and the Dutch Republic. The war, contemporary with the American Revolutionary War (1775–1783), broke out over British and Dutch disagreements on the legality and conduct of Dutch trade with Britain's enemies in that war.
Although the Dutch Republic did not enter into a formal alliance with the insurgent Americans and their French and Spanish allies, American envoy (and future president) John Adams had his credentials accepted as ambassador, establishing diplomatic relations with the Dutch Republic, making it the second European country to diplomatically recognize the United States of America in April 1782 as a sovereign nation.