Naval warfare in the Mediterranean during World War I took place between the naval forces of the Entente and the Central Powers in the Mediterranean Sea between 1914 and 1918.
Motoscafo armato silurante, alternatively Motoscafo antisommergibili and commonly abbreviated as MAS, was a class of fast torpedo-armed vessels used by the Regia Marina during World War I and World War II. Originally, "MAS" referred to motobarca armata SVAN, Società Veneziana Automobili Navali.
The Adriatic Campaign of World War I was a naval campaign fought between the Central Powers and the Mediterranean squadrons of Great Britain, France, the Kingdom of Italy, Australia, and the United States.
Cesare Rossarol was an Italian scout cruiser. Commissioned into service in the Italian Regia Marina in 1915, she served during World War I, participating in the Adriatic campaign until she was sunk in 1918.
Audace was a destroyer of the Italian Regia Marina. Originally, the Imperial Japanese Navy ordered her as the Urakaze-classKawakaze, but the Japanese sold her to the Kingdom of Italy in 1916 while she was under construction. Commissioned in 1917, she played an active role in the Adriatic campaign of World War I. During the interwar period, she operated in the Adriatic, Aegean, Mediterranean, and Red seas and was reclassified as a torpedo boat in 1929.
T5 was a sea-going torpedo boat operated by the Royal Yugoslav Navy between 1921 and 1941. Originally 87 F, a 250t-class torpedo boat of the Austro-Hungarian Navy built in 1914–1915, she was armed with two 66 mm (2.6 in) guns and four 450 mm (17.7 in) torpedo tubes, and could carry 10–12 naval mines. She saw active service during World War I, performing convoy, patrol, escort and minesweeping tasks, anti-submarine operations and shore bombardment missions. In 1917 the suffixes of all Austro-Hungarian torpedo boats were removed, and thereafter she was referred to as 87. She was part of the escort force for the Austro-Hungarian dreadnought Szent István during the action that resulted in the sinking of that ship by Italian torpedo boats in June 1918, and rescued many of her crew.
T2 was a seagoing torpedo boat operated by the Royal Yugoslav Navy between 1923 and 1939. Originally 77 T, a 250t-class torpedo boat of the Austro-Hungarian Navy built in 1914, she was armed with two 66 mm (2.6 in) guns and four 450 mm (17.7 in) torpedo tubes, and could carry 10–12 naval mines. She saw active service during World War I, performing convoy, patrol, escort, minesweeping and minelaying tasks, anti-submarine operations, and shore bombardment missions. In 1917, the suffixes of all Austro-Hungarian torpedo boats were removed, and thereafter she was referred to as 77. The vessel was in the Bocche di Cattaro during the short-lived mutiny by Austro-Hungarian sailors in early February 1918; members of her crew raised the red flag but undertook no other mutinous actions. 77 was part of the escort force for the Austro-Hungarian dreadnought Szent István during the action that resulted in the sinking of that ship by Italian torpedo boats in June 1918.
T4 was a seagoing torpedo boat operated by the Royal Yugoslav Navy between 1921 and 1932. Originally 79 T, a 250t-class torpedo boat of the Austro-Hungarian Navy built in 1914, she was armed with two 66 mm (2.6 in) guns and four 450 mm (17.7 in) torpedo tubes, and could carry 10–12 naval mines. She saw active service during World War I, performing convoy, patrol, escort and minesweeping tasks, anti-submarine operations and shore bombardment missions. In 1917 the suffixes of all Austro-Hungarian torpedo boats were removed, and thereafter she was referred to as 79. Underway during the short-lived mutiny by Austro-Hungarian sailors in early February 1918, her captain realised the danger and put her crew ashore. She was part of the escort force for the Austro-Hungarian dreadnought Szent István during the action that resulted in the sinking of that ship by Italian torpedo boats in June 1918.
The Novara class was a class of three scout cruisers built for the Austro-Hungarian Navy. Named for the Battle of Novara, the class comprised SMS Saida, SMS Helgoland, and SMS Novara. Construction started on the ships shortly before World War I; Saida and Helgoland were both laid down in 1911, Novara followed in 1912. Two of the three warships were built in the Ganz-Danubius shipyard in Fiume; Saida was built in the Cantiere Navale Triestino shipyard in Monfalcone. The Novara-class ships hold the distinction for being the last cruisers constructed by the Austro-Hungarian Navy.
SMS Admiral Spaun was a scout cruiser built for the Austro-Hungarian Navy. Named for Admiral and Marinekommandant Hermann von Spaun, Admiral Spaun was constructed shortly before World War I. Laid down at the Pola Navy Yard in May 1908, the cruiser was launched in October 1909. Admiral Spaun was commissioned into the Navy just over a year later, in November 1910. The first ship of the Austro-Hungarian Navy to be constructed with steam turbines, her design later influenced the construction of the Novara-class cruisers.
Giuseppe Cesare Abba was an Italian Rosolino Pilo-class destroyer. Commissioned into service in the Italian Regia Marina in 1915, she served in World War I, playing an active role in the Adriatic campaign. Reclassified as a torpedo boat in 1929, she participated in the Mediterranean and Adriatic campaigns of World War II. In 1943, she switched to the Allied side, operating as part of the Italian Co-belligerent Navy for the remainder of the war. She served in the postwar Italian Navy and was reclassified as a minesweeper in 1954. She was stricken in 1958.
Francesco Nullo was an Italian Rosolino Pilo-class destroyer. Commissioned into service in the Italian Regia Marina in 1915, she served in World War I, participating in the Adriatic campaign. She supported Gabriele D'Annunzio′s actions in Fiume in 1920, and was renamed Fratelli Cairoli in 1921. Reclassified as a torpedo boat in 1929, she served in the Mediterranean campaign of World War II until she was sunk in 1940.
Pilade Bronzetti was an Italian Rosolino Pilo-class destroyer. Commissioned into service in the Italian Regia Marina in 1916, she served in World War I, participating in the Adriatic campaign. Her crew supported Gabriele D'Annunzio′s actions in Fiume in 1920, and as a consequence she was renamed Giuseppe Dezza in 1921. Reclassified as a torpedo boat in 1929, she took part in the Mediterranean campaign of World War II until the Italian armistice with the Allies, prompting Nazi Germany to capture her. Subsequently operating in the Kriegsmarine as TA35, she participated in the Adriatic Campaign of World War II until she was sunk in 1944.
Animoso was the second and final Audace-class destroyer of the Italian Regia Marina. Commissioned in 1914, she played an active role in the Adriatic campaign of World War I. Badly damaged by an accidental explosion in 1921, she was stricken in 1923.
Ardito was the lead ship of the Italian Ardito-class destroyers. Commissioned into service in the Italian Regia Marina in 1913, she served in World War I, playing an active role in the Adriatic campaign. Reclassified as a torpedo boat in 1929, she was discarded in 1931.
Ardente was the second and final unit of the Italian Ardito-class destroyers. Commissioned into service in the Italian Regia Marina in 1913, she served in World War I, playing an active role in the Adriatic campaign. Reclassified as a torpedo boat in 1929, she was discarded in 1937.
Giuseppe Sirtori was the lead ship of the Giuseppe Sirtori-class destroyers. Commissioned into service in the Italian Regia Marina in 1916, she served during World War I, participating in the Adriatic campaign. During the interwar period, she took part in operations related to the Corfu incident in 1923 and was reclassified as a torpedo boat in 1929. During World War II, she took part in the Mediterranean campaign and later the Adriatic campaign until she was scuttled in 1943.
Giovanni Acerbi was the second of four Giuseppe Sirtori-class destroyers built for the Italian Regia Marina during World War I. She played an active part in the later stages of that war's Adriatic campaign, including a significant role in that campaign's largest surface action, the Battle of the Strait of Otranto in 1917. Reclassified as a torpedo boat in 1929, she was serving in the Red Sea Flotilla when Italy entered World War II in June 1940. She was disabled in September 1940, stripped of her armament, and either scuttled or sunk in 1941.
Vincenzo Giordano Orsini was the third of four Giuseppe Sirtori-class destroyers built for the Italian Regia Marina during World War I. Commissioned in 1917, she participated in the later stages of that war's Adriatic campaign. Reclassified as a torpedo boat in 1929, she was serving in the Red Sea Flotilla when Italy entered World War II in June 1940. She was scuttled in 1941 to prevent her capture by Allied forces during the East African campaign.
Aquila was an Italian Regia Marina scout cruiser in commission from 1917 to 1937. She was laid down for the Royal Romanian Navy as the destroyer Vifor but the Kingdom of Italy requisitioned her while she was under construction. She served in the Regia Marina during World War I, seeing action in the later stages of the Adriatic campaign. In 1928, she took part in rescue operations in the Adriatic Sea for the sunken Italian submarine F 14.
Italy 
Austria-Hungary 