Basile Petros IV Avkadian
| Styles of Basile Petros IV Avkadian  | |
|---|---|
| Reference style | His Beatitude | 
| Spoken style | Your Beatitude | 
| Religious style | Catholicos | 
| Posthumous style | Not Applicable | 
Basile Petros IV Avkadian (in Armenian Բարսեղ Պետրոս Դ. Աւգատեան ) was an Armenian Catholic Patriarch from Aleppo, Syria from 1780 until 1788. It was said of him that "[H]e never took off his monachal garment when he was bishop and Catholicos".