Kirchweger is a German surname. Notable people with the surname include:

• Heinrich Kirchweger (1809–1899), German railway engineer
  • Kirchweger condenser, a device to preheat feedwater in a steam locomotive using the exhaust steam from the engine
• Ernst Kirchweger (1898–1965), Nazi concentration camp survivor and the first person to die as a result of political conflict in Austria's Second Republic
  • Ernst-Kirchweger-Haus, a building in Vienna's 10th district, Favoriten

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