Ronald Grossarth-Maticek (19 June 1940) is a German sociologist specializing in the field of medical sociology, working in the fields of psychosomatics, psycho-oncology and health promotion. He is the director of the Institute for Preventive Medicine and professor for postgraduate studies (ECPD). In 2019, some of the works of Maticek and his co-author, psychologist Hans Eysenck, were reviewed by King's College London and 26 were declared "unsafe".