This dissertation is an examination of the operations of U.S. battleships in World War I. The study examines tactical cooperation between units of the U.S. Atlantic Fleet and the British Grand Fleet and relations between the two navies; the efficiency of U.S. battleships in terms of both personnel and material; and the strategic ideas of U.S. naval leaders governing the use of capital ships. The manuscript is based primarily on records of the Department of the Navy in the National Archives and Admiralty records at the Public Record Office. Also important are the private papers of principal naval leaders, located at the Library of Congress and the National Maritime Museum in Greenwich, U.K. The published memoirs of several of the participants are also utilized. The first chapter examines Anglo-American naval relations and traces diplomatic events leading to the U.S. Navy Department's decision to dispatch dreadnought battleships to European waters. The following two chapters discuss the amalgamation of Battleship Division Nine into the British Grand Fleet. Chapter IV examines the gunnery efficiency of U.S. battleships serving with the Grand Fleet. Chapter V reviews Anglo-American planning for a possible German battle cruiser raid against the Atlantic convoys. Chapter VI deals with the movement of Battleship Division Six to Berehaven, Ireland. Chapter VII discusses the use of pre-dreadnought battleships as training ships, convoy escorts, and troop transports. The study concludes that U.S. battleships made a subsidiary, but important contribution toward victory at sea. The addition of U.S. battleships allowed the Allies to protect Scandinavian commerce and the supply lines from the United States from German surface raiders while also maintaining superiority in the North Sea.