Marion T. Ross (1881–1937) was an American illustrator and cartoonist based in the Chicago area. He became particularly well known for his newspaper comic Mamma's Angel Child and for his wonderfully eccentric children's-book illustrations.

Ross worked on a whole series of lavishly illustrated children's books during this period, including The Flower Children (1910), Bird Children (1912), Animal Children (1913), The Butterfly Babies (1914), and Mother Earth's Children (1914).