Tomis may refer to:
- The historical name of Constanța, a city in Romania
- Sitticus, a genus of jumping spiders (synonymized with Tomis in 1991)
- C.S. Volei 2004 Tomis Constanța - female volleyball club from Constanţa, Romania
- C.V.M. Tomis Constanţa - male volleyball club from Constanţa, Romania
Tomis was a fort in the Roman province of Moesia. According to Tabula Peutingeriana it is situated between Stratonis and Histriopolis.