SS Walnut was a refugee ship converted from a British minesweeping Tree-class trawler which carried Baltic refugees from Sweden to Canada in 1948. The refugees' arrival at Pier 21 in Halifax, Nova Scotia led to a controversy which played an important role in shaping Canada's postwar refugee policies. Initially entering service during the Second World War as HMS Walnut, the trawler was sold for commercial purposes following the war. Converted for use as a cargo ship, the vessel retained the name Walnut until 1959 when sold and renamed Keta. The ship was broken up in 1976.