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.
He fell out of parliament in 1985, but was re-elected for three consecutive four-year terms from 1989.
He left the party in 2001, and failed to get re-elected to parliament again in the election later the same year, having stood for a local electoral list.