Mary Gibson Henry (1884 – 1967) was an influential American botanist, plant collector, and horticulturalist best known for her extensive field explorations and her lifelong passion for native plants. One of the 20th century’s early conservationists, she sought to preserve North American native plants and save them from the degradation and loss of natural habitat. An intrepid explorer, she made a series of botanical collecting expeditions on horseback into portions of British Columbia between 1931 through 1935. She took nearly 100 incredible expeditions into uncharted wilderness throughout the Americas. She is most renowned for having surveyed the peak of Mount Mary Henry in British Columbia which was consequently named after her.