Jon "Jo" Nesbø (Norwegian: [ˈjuː ˈnɛ̀sbøː]; born 29 March 1960) is a Norwegian writer, musician, and former football player and reporter. More than 3 million copies of his novels had been sold in Norway as of March 2014, and he had sold over 50 million copies worldwide by 2021, making him the most successful Norwegian author of all time. His work has been translated into more than 50 languages.

Known primarily for his crime novels featuring Inspector Harry Hole, Nesbø is also the main vocalist and songwriter for the Norwegian rock band Di Derre. In 2007 he released his first children's book, Doktor Proktors Prompepulver (English translation: Doctor Proctor's Fart Powder). The 2011 film Headhunters is based on Nesbø's novel Hodejegerne (The Headhunters).