| Aizis | |
| Alt Names: | Aigizis, Aigizidava, Aigis, Aixis, Azizis, Zizis |
| Known As: | Castra of Fârliug |
| Previous Fortification: | Dacian |
| Robust Struct Material: | Stone |
| Robust Struct Dim1: | 130 |
| Robust Struct Dim2: | ? |
| Province: | Dacia |
| Admin Unit 1: | Dacia Superior |
| Admin Unit 2: | Dacia Apulensis |
| Links: | (Duleu) • Caput Bubali |
| Coordinates: | 45.5046°N 21.8584°W |
| Altitude M: | 176 |
| Map: | Romania |
| Place Name: | Ruieni Hill [1] |
| Location Town: | Fârliug |
| Location County: | Caraș-Severin |
| Ref:Ro:Ran: | 52794.02 |
| Condition: | Ruined |
Aizis was a fort in the Roman province of Dacia, built near the ancient town of Aizis through which Trajan passed at the start of his Second Dacian War.