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.
Lahlum is an active chess player with a FIDE rating of 2193 as of March 2014, having been an International Arbiter since 2000.
