Reiniger (German for "cleaner") is a German surname. Notable people with the surname include:
Alice-Maria Reiniger (born 1945), Brazilian television journalist Joe Reiniger (born 1970), American soccer player and coach Karl Reiniger (1910–1995), Swiss racewalker Lotte Reiniger (1899–1981), German animated film director and producer Otto Reiniger (1863–1909), German landscape painter Scott Reiniger (born 1948), American actor