| Singular | Plural | |
|---|---|---|
| Nominativ | ballista, ballistaeque | ballistae |
| Genitiv | ballistai, ballistae | ballistarum, ballistum |
| Dativ | ballistai, ballistae | ballistabus, ballistis, ballistisque |
| Akkusativ | ballistam | ballistas |
| Ablativ | ballistaeque, ballista, ballistad | ballistabus, ballistis, ballistisque |
| Vokativ | ballista, ballistaeque | ballistae |