Royal Swedish Yacht Club, KSSS (Swedish: Kungliga Svenska Segelsällskapet), is the largest and oldest yacht club in Sweden and one of the five oldest in the world, formed 15 May 1830. KSSS is also the oldest yacht club in Europe outside the British Isles.
Activities include racing, training, education, squadron sailing, match racing and club activities. KSSS also operates the port and has its own ports in Saltsjöbaden and Sandhamn.
The first regatta as KSSS organized took place 12 September 1833 and the first regatta with prizes 1854th Each year KSSS offshore regatta Gotland Runt, who sailed around the island of Gotland and handicap Sandhamn Regatta at Sandön in the Stockholm archipelago.