| Singular | Plural | |
|---|---|---|
| Nominativ | catacumba | catacumbae |
| Genitiv | catacumbae, catacumbai | catacumbarum, catacumbum |
| Dativ | catacumbai, catacumbae | catacumbis, catacumbabus |
| Akkusativ | catacumbam | catacumbas |
| Ablativ | catacumba, catacumbad | catacumbis, catacumbabus |
| Vokativ | catacumba | catacumbae |