Grabner is a German surname. Notable people with the surname include:
Hermann Grabner (1886–1969), Austrian composer and music teacher
Maximilian Grabner (1905–1948), Austrian Gestapo chief in Auschwitz
Michael Grabner (born 1987), Austrian professional ice hockey player
Michelle Grabner (born 1962), American painter
Siegfried Grabner (born 1975), Austrian professional snowboarder