| Type: | Archbishop |
| Honorific Prefix: | His Excellency |
| Giulio Cesare Viancini | |
| Archbishop of Sassari | |
| Church: | Roman Catholic Church |
| Archdiocese: | Sassari |
| Appointed: | --> |
| Term Start: | 10 July 1763 |
| Term End: | 22 October 1797 |
| Retired: | --> |
| Ordination: | 21 February 1750 |
| Birth Date: | 18 August 1726 |
| Birth Place: | Savigliano |
| Death Place: | Biella |
| Tomb: | --> |
| Nationality: | Italian |
| Partner: | --> |
| Previous Post: | --> |
Giulio Cesare Viancini (19 August 1726 – 22 October 1797) was the elected Archbishop of Sassari.