Fridtjof Knutsen (15 December 1894 – 4 August 1961) was a Norwegian journalist and crime novelist.
[2][3] Knutsen was a journalist in Dagsposten from 1914, Morgenposten from, Tidens Tegn from 1917 and Aftenposten from 1934.
[1] Some years after his death he was also called one of "the three great criminal and police reporters in Oslo", together with Georg Svendsen and Axel Kielland.
[1] Many were Norwegian adaptations of books originally written by Betty Cavanna, Berkeley Gray (Edwy Searles Brooks), Carolyn Keene (several people), Helen Louise Thorndyke (several people), and Clair Blank.
[1] Non-fiction books include De tause vitner: av rettskjemiker Ch.