Alma Mary Duncan (October 2, 1917 – December 15, 2004) was a Canadian painter, graphic artist, and filmmaker from Paris, Ontario.
A prolific artist working in a variety of mediums including charcoal, chalk pastel, ink, watercolour, oil paint, puppetry, and film, Duncan's style evolved drastically over the course of her career to include portraiture, precise representational drawings, machine aesthetic, and abstraction.