Johan Nicolay Tønnessen (30 November 1901 – 27 December 1987) was a Norwegian historian and schoolteacher.
degree at the Royal Frederick University in 1928, majoring in history and minoring in French and Latin.
He represented the Fascist party Nasjonal Samling, which with 10.9% of the vote had its third most successful city election in Gjøvik.
[1] During the occupation of Norway by Nazi Germany, when Nasjonal Samling was actually propelled to power as a collaborationist party, Tønnessen was arrested by the authorities in August 1943 for resistance work.
He was imprisoned in Bredtveit concentration camp until November, then in Møllergata 19, then from April to October 1944 at Akershus Fortress, and ultimately in Grini concentration camp until the war's end.