Kastner is a German language surname, originating from the medieval occupation Kastner ("bursary officer"). Notable people with the surname include:
Bruno Kastner (1890–1932), German actor
Daniel Kastner (born 1981), Austrian footballer
Daniel L. Kastner (fl. 2020), American researcher and physician
Elliott Kastner (1930–2010), American film producer
Hermann Kastner (1886–1957), German politician
Jean-Georges Kastner (1810–1867), French composer and musicologist
John Kastner (born 1969), Canadian musician and composer
Karl Wilhelm Gottlob Kastner (1783–1857), chemist, natural scientist
Kas Kastner, racing driver, racing car builder, racing team manager
Marc A. Kastner (born 1945), American physicist
Peter Kastner (1943 – 2008), Canadian born actor
Rudolf Kastner (1906–1957), Jewish-Hungarian lawyer, head of the Hungarian Aid and Rescue Committee during the Holocaust
Kastner train, after Rudolf Kastner
Sabine Kastner (* 1964), German-born American cognitive neuroscientist
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