Hansch or Hänsch or at times Haensch is a German surname. Notable people with the surname include:
Persons Hansch Anton Hansch (1813–1876), Austrian painter Corwin Hansch (1918–2011), American chemist and academic
Hänsch Klaus Hänsch (1938-2026), German politician Ralph Hansch (1924–2008), Canadian ice hockey player Theodor W. Hänsch (born 1941), German physicist
Haensch Annemarie Haensch, German table tennis player Günther Haensch (1923–2018), German linguist and lexicographer Richard Haensch German entomologist and insect dealer
See also Haenschia, a genus of clearwing (ithomiine) butterflies "Hänschen klein" German folk song by Franz Wiedemann (1821–1882)