Karl or Carl Klaus or Claus may refer to:
- Carl Friedrich Wilhelm Claus (1835–1899), Austrian zoologist
- Karl Ernst Claus (1796–1864), Russian chemist and discoverer of ruthenium
- Carl Friedrich Claus (1827–1900), German chemist and inventor
- Carl Klaus (born 1994), German footballer
This disambiguation page lists articles about people with the same name.
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