Retzer is a surname. Notable people with the surname include:
George Retzer (1883–1979), American wrestler Ken Retzer (1934–2020), American baseball player Michael Retzer (born 1946), American politician and diplomat Otto Retzer (born 1945), Austrian actor, producer and director Raoul Retzer (1919–1974), Austrian actor Stephan Retzer (born 1976), German ice hockey player