Interamnium (Greek: ) – also Interamna () – is an ancient Latin placename, meaning "between rivers", and may refer to:
Interamna Lirinas, no modern successor, on the Liri River Interamna Nahars (or Nahartium), the modern Terni; the rivers are the Nera and the Tiber Interamna Praetutiana (or Interamna Praetutianorum), the modern Teramo; the rivers are the Tordino and the Vezzola Interamnium, Calabria, near Sezzano Albanese; at the junction of the Coscile and Esaro rivers Interamnium Flavium, probably in Bembibre (Motto: Interamnium Flavium); the rivers are the Boeza and the Noceda 704 Interamnia, an asteroid named after the town of Teramo
See also Interamnia (disambiguation)