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Hans Olav Lahlum (born 12 September 1973) is a Norwegian historian, crime author, chess player and organizer, and politician. He has written biographies on Oscar Torp and Haakon Lie, and a history book about all the Presidents of the United States.

On May 22–23, 2013, he was interviewed by VG for 30 hours, 1 minute and 44 seconds, setting a Guinness World Record for the longest interview ever, beating the previous record by over four hours.