HMS Buttercup (K193) was a British corvette from the Second World War. The keel for this unit was laid in 1940, the launch took place in April 1941, and entry into service took place in the same year. The total length of the ship was 62.5 meters and a width of 10.1 meters. Full displacement reached approx. 950-1000 tons, and maximum speed - approx. 16 knots. The ship's armament included: a single 102 mm cannon, two 20 mm Oerlikon autocannons, a drop-off port and two depth charge launchers.
HMS Buttercup (K193) was one of the Flower class gunboats. The ships of this type were designed as units intended primarily for the protection of Allied Atlantic convoys, and their main task was ZOP (anti-submarine combat) activities. Their design was simplified as much as possible, as it was supposed to be suitable for mass production of units even in small shipyards, without adequate experience. Units of this type had an archaic, for the years of World War II, but simple to build, a power plant based on a reciprocating steam engine, and not - which was rather standard then - a steam turbine. During the war, units of this type were modernized - mainly by adding new hydroacoustic devices. One of the units of this class was just HMS Buttercup (K193) which was built at Harland and Wolff shipyard in Belfast, Northern Ireland. The unit served in the Belgian Navy under the same name in the period 1941-1944. At the end of 1944, however, it returned to the Royal Navy, but in December of that year it was handed over and later sold to Norway, where it served under the names Nordkyn and Thoris. It was withdrawn from service only in 1969.