| Helena Mary Pycior | |
| Birth Date: | 1947 |
| Nationality: | American |
| Alma Mater: | Cornell University |
| Occupation: | historian |
Helena Mary Pycior (born 1947) is an American historian known for her works in the history of mathematics, Marie Curie, and human-animal relations. She is a professor emerita of history at the University of Wisconsin–Madison.
Pycior has a master's degree in mathematics and a Ph.D. in history, both from Cornell University. Her 1976 doctoral dissertation was titled The Role of Sir William Rowan Hamilton in the Development of British Modern Algebra.
Pycior is the author of the book Symbols, Impossible Numbers, and Geometric Entanglements: British Algebra Through the Commentaries on Newton's Universal Arithmetick (Cambridge University Press, 1997), and the coeditor of Creative Couples in the Sciences (with Nancy G. Slack and Pnina G. Abir-Am, Rutgers University Press, 1996).