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