| Jurisdiction: | Diocese |
| Santander | |
| Latin: | Dioecesis Santanderiensis |
| Local: | Diócesis de Santander |
| Country: | Spain |
| Metropolitan: | Oviedo |
| Province: | Oviedo |
| Sui Iuris Church: | Latin Church |
| Rite: | Roman Rite |
| Established: | 12 December 1754 |
| Cathedral: | Cathedral Basilica of the Assumption of the Blessed Virgin in Santander |
| Area Km2: | 5,527 |
| Population: | 592,876 |
| Population As Of: | 2010 |
| Catholics: | 557,409 |
| Catholics Percent: | 94 |
| Bishop: | Manuel Sánchez Monge |
| Metro Archbishop: | Jesús Sanz Montes |
| Map: | Diocesis de Santander.png |
| Website: | Website of the Diocese |
The Diocese of Santander (Latin: Dioecesis Santanderiensis ) is a Latin Church diocese of the Catholic Church seated in Santander Cathedral in the city of Santander in the ecclesiastical province of Oviedo in Spain.