Olav Mosebekk (13 September 1910 – 1 December 2001) was a Norwegian graphic artist, illustrator and painter.
His parents were Ole Thorkelsen Mosebekk (Mosebæk) (1886–1972) and Marta Kathrine Børsum (1888–1952).
He studied at the Norwegian National Academy of Craft and Art Industry under August Eiebakke and Eivind Nielsen 1929-31 and the Norwegian National Academy of Fine Arts under Axel Revold and Per Krohg 1931–33.
He also conducted a number of study trips including to Spain and Portugal in 1936 and in France 1949–50.
He worked as illustrator for Arbeidermagasinet, and served as headmaster at the Norwegian National Academy of Craft and Art Industry (Statens håndverks- og kunstindustriskole in Oslo from 1947 to 1969.