Duch is a surname. Notable people with the surname include:
Bolesław Bronisław Duch (1885–1980), Polish general
Jaume Duch Guillot (born 1962), spokesperson of the European Parliament
Jordi Salvador i Duch (born 1964), Catalan politician
Rhys Duch (born 1986), Canadian lacrosse player
Sophea Duch, Cambodian singer
