Stengel is a surname. Notable people with the surname include:
Alfred Stengel (1868–1939), American surgeon
Casey Stengel (1890–1975), American Major League Baseball player and manager
Christian Stengel (1903-1986), French film director
E. Stengel, translator of Sigmund Freud's works from German to English
Henri Christian Michel de Stengel (1744–1796), General in the French Revolutionary Wars
Hermann von Stengel (1837–1919), Bavarian administrator, German politician and Finance Minister
Isaiah Stengel, birth name of Isaiah Shachar, Israeli historian
Kilien Stengel (born 1972), French gastronomic author, and a teacher of gastronomy
Lawrence F. Stengel (born 1952), United States federal judge
Richard Stengel, American editor
Werner Stengel (born 1936), German roller coaster designer and engineer