Casteel is a surname. Notable people with the surname include:
David Casteel, American politician Frank Casteel (1948–2019), American murderer Heaven Casteel, fictional character in V. C. Andrews novels Homer Casteel (1879–1958), American politician Homer Casteel Jr. (1919–1972), American painter, sculptor, writer and teacher Jeff Casteel (born 1962), American football coach Jordan Casteel (born 1989), American painter Joshua Casteel (1979–2012), American soldier, conscientious objector, and playwright Lauren Young Casteel (born 1953), American civil rights activist Miles W. Casteel (1895–1977), American football coach Ryan Casteel (born 1991), American baseball player Seth Casteel, American photographer
See also Casteels, another surname