Marij Pregelj (8 August 1913 – 18 March 1967) was a Slovene painter, considered one of the key figures in Slovene painting in the second half of the 20th century.

He was known for his oil paintings, mostly landscapes, still lifes, and portraits, and also for his illustrations, most notably those for the 1950 and 1951 editions of Anton Sovre's translation of Homer's Iliad and Odyssey.

He won the Levstik Award for his illustrations three times: in 1949 for his illustrations for France Bevk's collection of stories Otroška leta (My Childhood Years), in 1957 for Jack London's White Fang (Slovene title: Beli očnjak), and in 1959 for Hemingway's The Old Man and the Sea (Slovene title: Starec in morje).

[2] He won the Prešeren Award twice, in 1958 for his mosaic at the Worker's Union building in Trbovlje and in 1964 for an exhibition of his paintings in the Museum of Modern Art in Ljubljana the previous year.

From December 2017 to May 2018, a retrospective exhibition of Pregelj's oeuvre was held at the Museum of Modern Art in Ljubljana.