Geldner is a surname. Notable people with the surname Geldner include:
Georges Geldner (1872–unknown), Swiss football player Karl Friedrich Geldner (1852–1929), German linguist Karl Geldner (1927–2017), German politician Max Geldner (1875–1958), Swiss football player Niko Geldner (born 1972), German-Swiss biologist Roland Geldner (1870–1905), Swiss businessman