Kahr () is a German surname. Notable people with the surname include:
Andrew Kahr, executive Claudia Kahr (b 1955), Austrian judge Gustav Ritter von Kahr (1862–1934), German politician Madlyn Millner Kahr (1913–2004), American art historian, and educator
See also KAHR, radio station Kahr Arms, manufacturer The Confession of Ina Kahr, a 1954 West German crime film