Thomassen is a patronymic family name of Scandinavian origin. It literally means "Son of Thomas", i.e., approximately corresponds to Thomson. It may refer to one of the following persons:
- Dan Thomassen, a Danish football (soccer) defender
- Petter Thomassen, a Norwegian politician
- Einar Thomassen, a Norwegian Professor in Religious Studies
- Magne Thomassen, a speed skater from Norway
- Carsten Thomassen, a Danish mathematician
- Carsten Thomassen (journalist), a Norwegian journalist
- Mikkjal Thomassen, a Danish field hockey player
- Thomas Thomassen Heftye, a Norwegian politician
- Mariann Thomassen, a Norwegian musician from the rock band Surferosa
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