| Cum ex apostolatus officio | |
| Type: | bull |
| Pope: | Paul IV |
| Language Of Title: | latin |
| Translation Of Title: | By virtue of the Apostolic office |
| Signature Date: | 1559 |
| Subject: | Measures against heretics |
| Before: | Cum nimis absurdum |
| After: | Ad caritatis et misericordiae opera |
Cum ex apostolatus officio is the name of a papal bull issued by Pope Paul IV in 1559; it states that only Catholics can be elected Popes, to the exclusion of non-Catholics, including former Catholics who have become public and manifest heretics.[1]