| Singular | Plural | |
|---|---|---|
| Nominativ | gymnasiarchus | gymnasiarchi |
| Genitiv | gymnasiarchi | gymnasiarchorum, gymnasiarchum |
| Dativ | gymnasiarcho | gymnasiarchis |
| Akkusativ | gymnasiarchom, gymnasiarchum | gymnasiarchos |
| Ablativ | gymnasiarcho | gymnasiarchis |
| Vokativ | gymnasiarche | gymnasiarchi |