Wittwer is a surname. Notable people with the surname include:
Adrian Alejandro Wittwer (born 1986), Swiss extreme athlete and ice swimmer Andreas Wittwer (born 1990), Swiss professional footballer Hans Wittwer (1894–1952), Swiss architect and Bauhaus teacher Michael Wittwer (born 1967), German footballer Otto Wittwer (born 1937), Swiss professional ice hockey player Stefan Wittwer (born 1971), Swiss Nordic skier Sylvan Wittwer (1917–2012), American agronomist Uwe Wittwer (born 1954), Swiss artist