Sigurd Frithjof Herbern (22 November 1900 – 18 January 1987) was a Norwegian sailor. He competed, with Øivind Christensen as helm, in the Star event at the 1936 Summer Olympics.^[1]

From 1942 to 1944, Herbern was responsible for 'For konge og fedreland'^[2] (tr. "For King and Fatherland"), one of the illegal newspapers published during the German occupation of Norway during World War II. He hosted a printing press in a summerhouse on the island of Killingen in the Oslo Fjord. For his pains, he was eventually arrested, together with a number of distributors, by the Gestapo in 1944.^{[citation needed]}

He was also known for yacht building^[3] and for a number of yacht designs. The Norwegian Maritime Museum has a list of Hebern's designs.^[4] In the late 1940s Herbern designed the 'Killing [no]' sailboat, on the island of Killingen (hence the name). The design is a 5.25m-long one-design keelboat.^[5] He also designed the Junker 24.^[6]