S'Eliahn
- Full name: S'Eliahn
- Species: Romulan
- Gender: Male
- By February 2155: Centurion, controller, Romulan Star Navy, Romulan Guard; IRW Lha Aehallh (ENT Novel: The Good That Men Do)
- Death: February 20, 2155; IRW Lha Aehallh (ENT Novel: The Good That Men Do)
- Killed by Nveih t'Jaihen for failure to perform his duties