Dr. Marc van Roosmalen (born June 23, 1947) is a Dutch-Brazilian primatologist. He was elected as one of the "Heroes of the Planet" by Time magazine in 2000. His research has led to the identification of several new monkey species, as well as other animals and plants, although some of these identifications are challenged as dubious, unconvincing, or contradictory to the evidence. He is also an activist in the protection of the Brazilian rainforest. Van Roosmalen was awarded the honour of officer in the Order of the Golden Ark by Prince Bernhard of the Netherlands in 1997.