The Laxen class was a pair of coastal submarines operated by the Swedish Navy between 1915 and 1935. The vessels were some of the earliest Swedish submarines and a development of an initial design based on . The submarines, Laxen and Gäddan, were commissioned in 1914 and 1915, respectively. The submarines served for about two decades, with the first decommissioned in 1935 and the second in 1931.
In 1900, the Swedish Navy sent Carl Richson to the United States, who was ordered to study submarines. After his return, he was inspired by and designed , Sweden's first submarine. Over the next decade, Hajens design was further developed to create a fleet of coastal submarines. One of the later evolutions was the in 1909, which served as the basis for the Laxen class. Compared to their predecessors, the Laxen class featured improved engines and superstructure. An improved design, which featured an additional torpedo tube and better engines, entered service as the several years later.
The class measured in length with a beam of and displaced 140 tons surfaced and 170 tons submerged. The complement consisted of 10 officers and crew. They were powered by a pair of six-cylinder diesel engines and two electric motors that produced and , which drove two propellers. This gave a maximum speed of on the surface and submerged. Armament comprised a single torpedo tube mounted in the bow.
During World War I, Sweden primarily relied on the Swedish Navy to enforce the nation's neutrality. Swedish doctrine viewed submarines as a cheap method to counter enemy capital ships, and the Navy often pushed to build more boats. Both were built at the Karlskrona Navy Yard and were commissioned into the fleet by 1915. They served through World War I and were retired in the early 1930s.