Beryl Brintnall Simpson (born April 28, 1942) is a professor emerita in the Department of Integrative Biology at the University of Texas at Austin. Previously she was an associate curator at the Smithsonian National Museum of Natural History in the Department of Botany. She studies plant systematics and tropical botany, focusing on angiosperms found in the American Southwest, Mexico, and Central and South America. She was awarded the José Cuatrecasas Medal for Excellence in Tropical Botany for her decades of work on the subject.