HSwMS Gotland was an aircraft cruiser built for the Royal Swedish Navy during the 1930s. Completed in 1934, she was assigned to the Coastal Fleet and also served as a training ship for naval cadets in foreign waters until the beginning of World War II in 1939. During the war the ship conducted neutrality patrols and continued to serve as a training ship. Gotland was converted into an anti-aircraft cruiser in 1943–1944 as her floatplanes were obsolete and modern replacements could not be purchased. After the war ended in 1945, she became a dedicated training ship and resumed making lengthy foreign cruises with cadets.
HSwMS Clas Fleming was a cruiser-minelayer built before World War I for the Royal Swedish Navy. Completed in 1914, the ship performed limited neutrality patrols in the Sea of Åland and the northern reaches of the Stockholm Archipelago during the war. She was placed in reserve in 1917 to be modified to make laying mines safer and remained in that status until the beginning of World War II in 1939 to save money. Clas Fleming was activated for a short time that year to lay defensive minefields before she began a reconstruction that installed an early version of gas turbines, the first warship in the world to be so equipped. After her sea trials were completed in 1940, she was on active service for the rest of the war. Clas Fleming was again reduced to reserve at that time and did not leave the dockyard before she was stricken from the navy list in 1959. The ship briefly served as a target ship before being sold for scrap the following year.
HSwMS Wachtmeisterwas the second and last of the Wrangel-class destroyers built for the Royal Swedish Navy during World War I. Completed in 1918, the ship was rammed by another Swedish destroyer four years later. At the beginning of World War II in 1939 she was assigned to the Gothenburg Squadron. Wachtmeister was decommissioned in 1947 and was subsequently sold for scrap in 1950.
HSwMS Sjölejonet was the lead ship of a class of nine naval submarines in the service of the Swedish Navy from just before World War II into the early Cold War. The submarines were ordered in response to the rising German threat to the south in the interwar period. Sjölejonet remained in service until 1959 and was sold for scrap in 1962.
HSwMS Småland (J19) is a Swedish Halland-class destroyer. She and HSwMS Halland were the only ones built of their class. Two more ships were ordered but they were never completed.
The Tre Kronor class was a class of two cruisers built for the Swedish Navy during World War II, comprising Tre Kronor and Göta Lejon. Tre Kronor was discarded in 1968 and Göta Lejon was sold to Chile in 1971. Renamed Almirante Latorre, she remained in service until being discarded in 1986.
HSwMS Göta Lejon was a Swedish cruiser. Together with her sister ship Tre Kronor, they were the largest ships ever to serve in the Royal Swedish Navy. In 1971 Göta Lejon was sold to Chile where she was renamed Almirante Latorre and served in the Chilean Navy until 1984. She was sold to Taiwan in 1986 to be scrapped.
The Maestrale class were a group of destroyers built for the Regia Marina and served in World War II. They formed the basis for subsequent Italian destroyer designs; the Oriani and Soldati classes.
The Sella-class destroyers were a group of four destroyers built for the Regia Marina in the 1920s. Two of these ships fought in World War II and both were sunk after the Italian capitulation to the Allies. The two other ships were sold to the Swedish Navy in 1940 and were scrapped in the late 1940s.
The Ruotsinsalmi-class minelayers were a two-strong class of minelayers in the Finnish Navy. The two ships, comprising Ruotsinsalmi and Riilahti, were constructed in Finland and saw service in the Winter War and World War II. Riihahti was sunk in an engagement with Soviet motor torpedo boats on 23 August 1943. Ruotsinsalmi survived the wars and remained in service in the post war Finnish Navy until being withdrawn in the 1970s.
The Göteborg class was a Swedish World War II destroyer class. Built from 1936–1941 the class was designed as escort and neutral guard destroyers. In total six ships were constructed, HSwMS Göteborg, HSwMS Stockholm, HSwMS Malmö, HSwMS Karlskrona, HSwMS Gävle and HSwMS Norrköping. After World War II the destroyers, later rebuilt as frigates, continued to serve in the Swedish navy. The last ship was decommissioned in 1968.
The Klas class, also referred to as the Klas Horn class, was a pair of destroyers in service with the Swedish Navy from 1932 to 1958. They are sometimes considered part of the preceding Ehrensköld-class destroyers. Two ships in the class was constructed between 1930 and 1932, HSwMS Klas Uggla and HSwMS Klas Horn. The ships were involved in the Hårsfjärden disaster in 1941, in which both ships were damaged. Klas Uggla was raised but decommissioned, Klas Horn was repaired and continued to serve in the navy until 1958.
The Wrangel class was a class of four destroyers built for the Royal Swedish Navy during World War I of which two were cancelled before they were laid down. Completed in 1918, they were in service until shortly after the end of World War II in 1945. Wrangel served as a target ship before she was sunk in 1960 and Wachtmeister was broken up for scrap in 1951.
Several ships of the Swedish Navy have been named HSwMS Tordön or HSwMS Thordön, named after the Old Norse word for thunder:
Camicia Nera was one of nineteen Soldati-class destroyers built for the Regia Marina in the late 1930s and early 1940s. Completed in 1938, she was the first ship of the first batch of a dozen ships to enter service. In July 1943, due to the fall of the Fascist regime she was renamed Artigliere, a name formerly held by a sister ship that had been sunk 3 years earlier. She was transferred to the Soviet Navy as a war reparation in 1950, renamed Lyogkyy, and expended as a target in 1954.
Corazziere was one of nineteen Soldati-class destroyers built for the Regia Marina in the late 1930s and early 1940s. Completed in mid-1939, she was the last of the first batch of a dozen ships to enter service.
Geniere was one of nineteen Soldati-class destroyers built for the Regia Marina in the late 1930s and early 1940s. Completed in 1938, she was one of the first of the first batch of a dozen ships to enter service.
Grantiere was one of nineteen Soldati-class destroyers built for the Regia Marina in the late 1930s and early 1940s. Completed in early 1939, she was one of the last of the first batch of a dozen ships to enter service.
Alfredo Oriani was the lead ship of her class of four destroyers built for the Regia Marina in the mid-1930s. Completed in 1937, she served in World War II. Alfredo Oriani took part of the battle of Matapan and the attack on Harpoon convoy.
HSwMS Halland (J18) was the lead ship of the Halland-class destroyer. She and HSwMS Småland were the only ones built of their class. Two more ships were ordered but they were never completed.
Sweden 
