Thoreau MacDonald (1901–1989) was a Canadian illustrator, graphic designer, and artist, best known for his black-and-white illustrations due to his color blindness. Son of Group of Seven member J. E. H. MacDonald, he was self-taught but worked closely with his father in commercial design. His work spanned book design, illustration, and lettering, notably for Ryerson Press, Macmillan Company, and his own Woodchuck Press (1933–1946). His illustrations for Maria Chapdelaine (1938) were among his finest. MacDonald's art is held in collections such as the National Gallery of Canada and the McMichael Canadian Art Collection. His former home and garden in Vaughan, Ontario, donated in 1974, is now open to the public.