Thomassin (disambiguation)
Thomassin may refer to:
People
Surnames
- Claude Thomassin, French bow maker, or Archetier
 - Florence Thomassin, French actress and sculptor
 - Laurie Thomassin, French retired breaststroke swimmer
 - Louis Thomassin, French theologian and Oratorian
 - Louis Thomassin (archetier), French bow maker, or Archetier
 - Antoine de Thomassin de Peynier (1731–1809), officer of the French Royal Navy
 
Places
- Thomassin, a neighborhood of Pétion-Ville, Haiti