Kostner is a German and Dutch surname and also a germanised version of the Ladin surname Costa.
Notable people Aaron Kostner (born 1999), Italian Nordic combined skier Carolina Kostner (born 1987), Italian figure skater Diego Kostner (born 1992), Italian professional ice hockey Erwin Kostner (born 1958), Italian ice hockey coach and former player Isolde Kostner (born 1975), Italian Alpine skier Michael Kostner (born 1969), German football coach and a player Patrick Kostner (born 1988), Austrian footballer Simon Kostner (born 1990), Italian ice hockey forward Ulrico Kostner (born 1946), retired Italian cross-country skier
See also Koster (surname)