Marie Collart-Henrotin was a Belgian artist who mainly painted landscapes and animals.

She was born in Brussels. Collart was primarily self-taught as an artist, but benefited from the advice of Alfred Verwee, Léonce Chabry and the art dealer and critic Arthur Stevens. She became a founding member of the Société Libre des Beaux-Arts in 1868. In 1870, she won a gold medal at the Salon des artistes français. In 1871, Collart married Edmond Henrotin, an artillery captain; he died in 1894. She became the first women to be named a Chevalier in the Belgian Order of Leopold in 1880. She won gold medals at exhibitions in Ghent (1881), in Paris and in Brussels (1897). Collart exhibited her work at the Palace of Fine Arts and The Woman's Building at the 1893 World's Columbian Exposition in Chicago, Illinois.

Collart died at Nebida in Sardinia at the age of 68.

Her work is included in the collections of the Royal Museum of Fine Arts Antwerp and Royal Museums of Fine Arts of Belgium.