Henry Stanley Plummer, M.D. ((1874-03-03)March 3, 1874 – December 31, 1936(1936-12-31)) was a prominent internist and endocrinologist who, along with Drs. William Mayo, Charles Mayo, Stinchfield, E. Starr Judd, Christopher Graham, and Donald Balfour founded Mayo Clinic. Dr. Plummer is also immortalized as the driving force behind the Plummer Building, which still stands as a part of the Clinic he helped establish.