Marcel Ichac, born October 22, 1906 in Rueil-Malmaison (Seine-et-Oise) and died April 9, 1994 in Ézanville (Val-d'Oise), was a French filmmaker, photographer, explorer, and mountaineer. He was the brother of Pierre Ichac (1901-1978).

"A great master of documentary filmmaking," according to historian Jean Tulard, Marcel Ichac is particularly considered "the greatest filmmaker specializing in mountain films in France and undoubtedly in the world" of his generation by Georges Sadoul. Initially a skier and mountaineer, a great witness to French mountaineering, Marcel Ichac went on to become, through the diversity of the spaces he explored, the filmmaker of French exploration in the 1930s and 1950s (the first two French expeditions to the Himalayas in 1936 and 1950, scuba diving with Jacques-Yves Cousteau, Greenland with Paul-Émile Victor, the world's first caving documentaries, notably with Norbert Casteret, etc.).