| Singular | Plural | |
|---|---|---|
| Nominativ | amphitheatrom, amphitheatrum, amphiteatrum | amphitheatra |
| Genitiv | amphiteatri, amphitheatri | amphitheatrorum |
| Dativ | amphitheatro | amphitheatris |
| Akkusativ | amphitheatrum, amphiteatrum | amphitheatra |
| Ablativ | amphitheatro | amphitheatris |
| Vokativ | amphitheatrum, amphiteatrum | amphitheatra |