Willey Glover Denis (February 26, 1879 – January 9, 1929) was an American biochemist and physiologist.

She was noted particularly for her collaborations with Otto Folin, including studies of protein metabolism.

[2] She attended Bryn Mawr College for two years, then returned to Tulane, where she was awarded an MA degree.

[1] Dennis then taught at Grinnell College for a year, moving to the U.S. Department of Agriculture where she worked until 1909.

[1] After attempts to attend medical school that ended due to harassment, she moved to Harvard Medical School to become a research assistant for Otto Folin; she worked part-time with Folin for about a decade.