Jon Marius Sæland Haarberg (born 1953) is a Norwegian literary scholar, and professor of literature at the University of Oslo.
Haarberg was an editor and later editor-in-chief of the publisher Universitetsforlaget from 1984 to 1992, when he became a research fellow at the University of Oslo.
His books include Vinje på vrangen (1985), Parody and the Praise of Folly (1997), Verdenslitteratur: Den vestlige tradisjonen (2007) and Nei, vi elsker ikke lenger: Litteraturen og nasjonen (2017).
He is also known for the historical-critical edition of Petter Dass' Katekismesanger (Catechism Songs).
He received the Article of the Year – Scandinavian University Press Academic Journal Prize in 2012.