John Charles Cutler (June 29, 1915 – February 8, 2003) was an American surgeon. He was the acting chief of the venereal disease program in the United States Public Health Service. He is known for leading several controversial and unethical human experiments of syphilis, done under the auspices of the Public Health Service. He willfully spread syphilis and gonorrhea to unwitting patients including (but not limited to) soldiers, prisoners, adults with leprosy, mental patients and orphan children as young as nine in the Guatemala syphilis experiments. He also conducted the Tuskegee syphilis experiments, in which African American men, not informed of the nature of the experiment, were deliberately denied treatment for syphilis.