521
| Years: 517 518 519 520 - 521 - 522 523 524 525 | |
| Decades: 490s 500s 510s - 520s - 530s 540s 550s | |
| Centuries: 5th century - 6th century - 7th century | |
Events
- Future Byzantine emperor Justinian becomes consul.
- Samson of Dol is ordained as a bishop.
- December 7 - Saint Columba at Gartan, Donegal
- Jacob of Serugh, Syrian writer