Voltaire was one of the six Danton-class semi-dreadnought battleships built for the French Navy in the first decade of the 20th century. Shortly after World War I began, the ship participated in the Battle of Antivari in the Adriatic Sea and helped to sink an Austro-Hungarian protected cruiser. She spent most of the rest of the war blockading the Straits of Otranto and the Dardanelles to prevent German, Austro-Hungarian and Turkish warships from breaking out into the Mediterranean. Voltaire was hit by two torpedoes fired by a German submarine in October 1918, but was not seriously damaged. After the war, she was modernized in 1923–1925 and subsequently became a training ship. She was condemned in 1935 and later sold for scrap.