Alma Mary Duncan (October 1917 – December 15, 2004) was a Canadian painter, graphic artist, and filmmaker.
She was born in the southern Ontario town of Paris, but attended high school in Hamilton, Ontario and Montreal, Quebec. Though largely self-taught as an artist, she studied with Canadian painter Adam Sheriff Scott as a teenager and later took studio drawing courses at the Roberts-Neumann School of Art.

In 1943, the National Film Board of Canada invited Duncan to join its Graphics Division. She worked first with the Information Display department, designing posters, publications, and travelling displays for National Film Board projects. She moved to the NFB’s Animation Department when the Graphics Division was disbanded and produced her first film, Folksong Fantasy (shown at the 1951 Edinburgh International Film Festival) while under contract with the NFB as an independent producer.

In 1951, Alma Duncan and her longtime partner, photographer Audrey McLaren, formed the film company Dunclaren Productions. Their first film, Kumak the Sleepy Hunter (1953) was a retelling of an Inuit legend using puppets and a stop-motion animation technique. It was nominated for a BAFTA award in 1954 as a documentary film. They produced two other films, Hearts and Soles (1955), which used the same animation techniques as Kumak, and Friendly Interchange (1959), which was made with chalk drawings. Though the production company never disbanded, it became inactive after 1960.

Folksong Fantasy, , provided by the National Film Board of Canada