Lucy Maria Field Wanzer (1841–1930) was the first woman to be admitted to and graduate from an American medical school west of the Rocky Mountains.

Wanzer was born Lucy Maria Field on October 11, 1841, in Wisconsin, living first in Milwaukee and later in Madison.

She was admitted after a four-month appeal that set a precedent allowing other women to attend medical schools throughout the UC system.

[1] After graduation, Wanzer was admitted to the San Francisco County Medical Society, but only after threats to "blackball" her failed.

[3] Her private practice, in a series of downtown San Francisco offices, focused on obstetrics and gynecology.