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| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 521 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 521 DXXI |
| Ab urbe condita | 1274 |
| Assyrian calendar | 5271 |
| Balinese saka calendar | 442–443 |
| Bengali calendar | −72 |
| Berber calendar | 1471 |
| Buddhist calendar | 1065 |
| Burmese calendar | −117 |
| Byzantine calendar | 6029–6030 |
| Chinese calendar | 庚子年 (Metal Rat) 3218 or 3011 — to — 辛丑年 (Metal Ox) 3219 or 3012 |
| Coptic calendar | 237–238 |
| Discordian calendar | 1687 |
| Ethiopian calendar | 513–514 |
| Hebrew calendar | 4281–4282 |
| Hindu calendars | |
| - Vikram Samvat | 577–578 |
| - Shaka Samvat | 442–443 |
| - Kali Yuga | 3621–3622 |
| Holocene calendar | 10521 |
| Iranian calendar | 101 BP – 100 BP |
| Islamic calendar | 104 BH – 103 BH |
| Javanese calendar | 408–409 |
| Julian calendar | 521 DXXI |
| Korean calendar | 2854 |
| Minguo calendar | 1391 before ROC 民前1391年 |
| Nanakshahi calendar | −947 |
| Seleucid era | 832/833 AG |
| Thai solar calendar | 1063–1064 |
| Tibetan calendar | 阳金鼠年 (male Iron-Rat) 647 or 266 or −506 — to — 阴金牛年 (female Iron-Ox) 648 or 267 or −505 |
Year 521 (DXXI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Sabbatius and Valerius (or, less frequently, year 1274 Ab urbe condita). The denomination 521 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.