| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1521 by topic |
|---|
| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1521 MDXXI |
| Ab urbe condita | 2274 |
| Armenian calendar | 970 ԹՎ ՋՀ |
| Assyrian calendar | 6271 |
| Balinese saka calendar | 1442–1443 |
| Bengali calendar | 928 |
| Berber calendar | 2471 |
| English Regnal year | 12 Hen. 8 – 13 Hen. 8 |
| Buddhist calendar | 2065 |
| Burmese calendar | 883 |
| Byzantine calendar | 7029–7030 |
| Chinese calendar | 庚辰年 (Metal Dragon) 4218 or 4011 — to — 辛巳年 (Metal Snake) 4219 or 4012 |
| Coptic calendar | 1237–1238 |
| Discordian calendar | 2687 |
| Ethiopian calendar | 1513–1514 |
| Hebrew calendar | 5281–5282 |
| Hindu calendars | |
| - Vikram Samvat | 1577–1578 |
| - Shaka Samvat | 1442–1443 |
| - Kali Yuga | 4621–4622 |
| Holocene calendar | 11521 |
| Igbo calendar | 521–522 |
| Iranian calendar | 899–900 |
| Islamic calendar | 927–928 |
| Japanese calendar | Eishō 18 / Daiei 1 (大永元年) |
| Javanese calendar | 1438–1439 |
| Julian calendar | 1521 MDXXI |
| Korean calendar | 3854 |
| Minguo calendar | 391 before ROC 民前391年 |
| Nanakshahi calendar | 53 |
| Thai solar calendar | 2063–2064 |
| Tibetan calendar | 阳金龙年 (male Iron-Dragon) 1647 or 1266 or 494 — to — 阴金蛇年 (female Iron-Snake) 1648 or 1267 or 495 |
1521 (MDXXI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar, the 1521st year of the Common Era (CE) and Anno Domini (AD) designations, the 521st year of the 2nd millennium, the 21st year of the 16th century, and the 2nd year of the 1520s decade.