A Millionaire for a Day is a 1912 American silent comedy film starring John R. Cumpson. It was produced by the Independent Moving Pictures (IMP) Company of New York.
The story is about a young woman who is a quarter Native American Indian, Mary Thorne (Glaum), who returns to the home of her prospector father, Marshall Thorne (Dowling), after completing her education in the East. She has a college degree and an air of refinement.