Fridtjof Knutsen (15 December 1894 – 4 August 1961) was a Norwegian journalist and crime novelist.
He was born in Harstad, and was married to Lalli Knutsen.[1] Their daughter Mette Knutsen married Philip Newth and had the son Eirik Newth.[2][3]
Knutsen was a journalist in Dagsposten from 1914, Morgenposten from, Tidens Tegn from 1917 and Aftenposten from 1934. He specifically reported from court cases.[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.[4]
Knutsen also wrote about 30 criminal novels, many together with his wife.[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.[5] Knutsen also wrote about 30 revues under the pseudonym Filius Kanuti.[1] Non-fiction books include De tause vitner: av rettskjemiker Ch. Bruffs memoarer (1949, with Georg Svendsen).