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