Margaret Webb Dreyer (29 September 1911 – December 17, 1976) — known to many as "Maggie" Dreyer — was an American painter, muralist, mosaic artist, educator, gallery owner, and political activist who spent most of her career in Houston, Texas. Though she worked in a number of styles and media over the years, she was best known as an abstract expressionist painter. Her work won numerous awards in major juried shows and was exhibited widely in museums and galleries.