The Italian cruiser San Marco was a San Giorgio-class armoured cruiser built for the Royal Italian Navy in the first decade of the 20th century. She was the first large Italian ship fitted with steam turbines and the first turbine-powered ship in any navy to have four propeller shafts. The ship participated in the Italo-Turkish War of 1911–1912, during which time she supported the occupations of Benghazi and Derna, the island of Rhodes, and bombarded the fortifications defending the entrance to the Dardanelles. During World War I, San Marco's activities were limited by the threat of Austro-Hungarian submarines, although the ship did participate in the bombardment of Durazzo, Albania in late 1918. She played a minor role in the Corfu incident in 1923 and was converted into a target ship in the first half of the 1930s. San Marco was captured by the Germans when they occupied northern Italy in 1943 and was found sunk at the end of the war. The ship was broken up and scrapped in 1949.

The San Giorgio class consisted of two armored cruisers built for the Royal Italian Navy in the first decade of the 20th century. The second ship, San Marco, was used to evaluate recently invented steam turbines in a large ship and incorporated a number of other technological advances. The ships participated in the Italo-Turkish War of 1911–1912, although San Giorgio was under repair for most of the war. San Marco supported ground forces in Libya with naval gunfire and helped them to occupy towns in Libya and islands in the Dodecanese. During World War I, the ships' activities were limited by the threat of Austro-Hungarian submarines, although they did bombard Durazzo, Albania in 1918.