Winternitz is a surname of Jewish origin. Notable people with the surname include:
Adolfo Winternitz (1906–1993), Austrian-Peruvian Jewish painter Emanuel Winternitz (1898–1983) Austrian-American curator Jill Winternitz (born 1986/1987), American actress Moriz Winternitz (1863–1937), Austrian Jewish indologist Moshe Dovid Winternitz (1855–1944), Hungarian rabbi Pavel Winternitz (born 1936), Czech-Canadian mathematical physicist Roland Winters, born Roland Winternitz (1904–1989), American actor Wilhelm Winternitz (1834–1917), Austrian balneologist