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

• Costner
• Kästner
• Kestner

This page lists people with the surname Kastner.
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