Deininger is a surname. Notable people with the surname include:
Beate Deininger (born 1964), German field hockey player David G. Deininger (born 1947), American politician and jurist Leonhard Deininger (1910–2002), German politician Pep Deininger (1877–1950), German baseball player Wunibald Deininger (1879–1963), Austrian architect and art teacher
See also Deninger, another surname