Klahr is a surname. Notable people with the surname include:
- Alfred Klahr (1904–1944), Austrian historian and politician
- David Klahr (born 1939), American psychologist
- Jerome Klahr Huddle (1891–1959), American diplomat
- Lewis Klahr (born 1956), American animator and filmmaker
- Marco Lara Klahr, Mexican professor and journalist
See also
- Klahr, Pennsylvania, United States
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