| Riniasa Castle | |
|---|---|
Κάστρο Ῥινιάσας | |
| Riza, Western Greece | |
  Riniasa Castle | |
| Coordinates | 39°04′49″N 20°21′12″E / 39.0803°N 20.3533°E |
| Type | hilltop citadel |
| Height | 185 m |
| Site information | |
| Owner | Greek Ministry of Culture |
| Controlled by |
|
| Open to the public | Yes |
| Condition | ruin |
| Site history | |
| Built | late 13th century/early 14th century |
| Built by | Byzantine Empire |
| Materials | hewn stone (ashlar) |
Riniasa Castle (Greek: Κάστρο Ῥινιάσας), originally known as Thomokastron (Greek: Θωμόκαστρον, lit. 'Castle of Thomas'), is a medieval Byzantine fortress on the coast of Epirus, close to the modern village of Riza near Preveza. The castle is today in a ruinous condition.