Inarthos
- Full name: Inarthos
- Species: Romulan
- Gender: Male
- Noble born (TNG Novel: Death in Winter)
- Family patriarch during his life (TNG Novel: Death in Winter)
- Eldest son
- Father of Eborion (TNG Novel: Death in Winter)
- Son: Claboros
- Son: Rijanus
- Son: Obrix
- Daughter: Cly'rana
- Mid-22nd century: Owner of various directed energy weapon concerns (TNG Novel: Death in Winter)
- Provided majority of such weaponry to Romulan Star Empire during the Earth-Romulan War (TNG Novel: Death in Winter)