Fridtjof Frank Gundersen (29 October 1934 – 11 November 2011) was a Norwegian professor of jurisprudence and politician. He worked as a lector at the Faculty of Law of the University of Oslo from 1965 to 1975. In 1975 he became professor of jurisprudence at the Norwegian School of Economics.Gundersen was elected a Member of Parliament in 1981 representing the Progress Party platform, but did not formally join the party until 1990.