Frederick Winslow Hatch III, also known as F. W. Hatch was an American psychiatrist, eugenicist, and California state-appointed official. He served as the General Superintendent of State Hospitals in California for some 20 years, where he implemented sterilization on patients and historically influenced early mental health treatment in the state. Hatch served as a forensic psychiatrist for the criminally insane, and he was associated with some of the most important criminal trials on the West Coast in the early 20th-century.