Emma K. Willits (20 September 1869 – 9 April 1965) was a physician and surgeon who played an important role in the development of Children's Hospital in San Francisco (now the California campus [Women and Children's Center] of the California Pacific Medical Center), serving as the head of the Department of General Surgery from 1921 to 1934.
After receiving her medical degree in 1896, she served her internship at the Women's Hospital of Chicago.
In 1921 she became the chair of the Department of General Surgery, a position she held until 1934 when she stepped down but continued to serve as a consulting physician and surgeon.
Over the course of her career, she visited the Mayo Clinic several times and spent several months studying in Vienna in 1923.
Willits' house in Palo Alto, constructed in 1926–27, was designed by architect Lionel H.