Castaing is a surname. Notable people with the surname include:
Edme Castaing (1796–1823), French physician and murderer Francis Castaing (born 1957), French bicycle racer François Castaing (born 1945), French automotive executive Jacques Chastenet de Castaing (1893–1978), French journalist, historian and diplomat Jean Castaing (), French inventor and mint official Jean Castaing (playwright) (1723–1805), printer and playwright Lucien Castaing-Taylor (born 1966), British anthropologist and artist Madeleine Castaing (1894–1992), French antique dealer and interior designer
See also Castang (disambiguation) Casting (disambiguation)