Jørn Lier Horst (born 27 February 1970) is a Norwegian author of crime fiction and a former Senior Investigating Officer at Vestfold police district.

[2] Horst made his writing debut in 2004 with Key Witness, based on a true murder story.

[3] Together with Thomas Enger, he writes the thriller series about policeman Alexander Blix and news blogger Emma Ramm.

In 2023 Horst participated in the fourth season of Masked Singer Norway, disguised as The Magician (Magikeren).

2 (no) 2023 Chosen as writer of the year by Aftenposten Junior (no) 2024 Winner of The Finnish Whodunnit Society's honorary award for Excellence in Foreign Crime Writing (fi) 2024 The Riverton Prize shortlist for Victim (no) 2024 The Petrona Award shortlist for Snow Fall(uk)