Mary Augusta Hiester Reid was an American-born Canadian painter and teacher. She was best known as a painter of floral still lifes, and by 1890 she was thought to be the most important flower painter in Canada. She also painted domesticated landscapes, night scenes, and, less frequently, studio interiors and figure studies. Her work as a painter is related in a broad sense to Tonalism and Aestheticism or "art for art's sake".
She was made a member of the Ontario Society of Artists in 1887, and in 1907 became only the second woman to serve on its executive committee. She was also one of the first women to be elected an Associate of the Royal Canadian Academy of Arts in 1893. She was elected to join the Canadian Society of Applied Art in 1904.