Diderot was one of the six Danton-class semi-dreadnought battleships built for the French Navy in the early 1900s. 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. Diderot briefly participated in the occupation of Constantinople after the end of the war. She was modernized in 1922–1925 and subsequently became a training ship. The ship was condemned in 1936 and later sold for scrap.