Helen Katherine Myers Sharsmith (August 26, 1905 – November 10, 1982) was an American biologist.
Helen Sharsmith was born 1905 in Oakland, California. She received an AB and MA from University of California, Berkeley in 1927 and 1928, then worked as a high school and junior college teacher. She met her future husband, Carl Sharsmith, while taking a class in the Yosemite Outdoor Field School in Yosemite National Park. She and her husband married and both earned doctorates from University of California, Berkeley, hers in 1940.
Sharsmith was a research assistance at University of California and a biology teacher while working on her degree. Later, she worked as a biology assistant at the Carnegie Institution of Washington and a senior botanist at Berkeley, where she retired in 1969.
Sharsmith's dissertation was later published as a book, Flora of the Mount Hamilton Range of California (1945). This was the result of extensive field research in the area. She also wrote Spring Wildflowers of the San Francisco Bay Region (1965).
Sharsmith died 1982 in Alameda County, California.
- Sharsmith's stickseed (Hackelia sharsmithii) — named for her husband by I.M. Johnston, but discovered by Sharsmith and her husband Carl Sharsmith at Mirror Lake after climbing Mount Whitney
- Sharsmith's Onion (Allium sharsmithiae) (Ownbey & Aase ex Traub) McNeal — Aliso or Allium fimbriatum S. Watson var. sharsmithiae Ownbey & Aase ex Traub.). Endemic to Mount Hamilton area of the Diablo Range in the southeastern San Francisco Bay Area.
- Sharsmith's harebell (Campanula sharsmithiae), or Mt. Hamilton Bellflower (N. Morin) — endemic to Mount Hamilton area of the Diablo Range in the southeastern San Francisco Bay Area.
- Sharsmith's draba (Draba sharsmithii), or Mount Whitney draba (Rollins and R.A. Price) — endemic to southern Sierra Crest in Mount Whitney area.
- O'Neill, Elizabeth Stone, Mountain Sage: The Life of Carl Sharsmith Yosemite Ranger/Naturalist 2d ed. (1996) ISBN 0-939666-47-2.