Claessens
Claessens is a Dutch patronymic surname meaning "son of Claes ". It may refer to:
- Alain Claessens, French actor
- Artus Claessens, Flemish still-life painter
- August Claessens, American politician
- , Belgian theater and movie actor
- Dieter Claessens, German sociologist
- Dominicus Claessens, Flemish Baroque painter
- François Claessens, Belgian gymnast
- Gert Claessens, Belgian footballer
- Jean Claessens, Belgian footballer
- Lambertus Antonius Claessens , Flemish engraver and publisher
- Olivier Claessens, Belgian footballer
- Stijn Claessens, Dutch economist
