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1521 (MDXXI) was a common year starting on Tuesday 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.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| 1521 | - Kali Yuga | 4621–4622 | 1.00 | infobox |
| 1521 | - Shaka Samvat | 1442–1443 | 1.00 | infobox |
| 1521 | - Vikram Samvat | 1577–1578 | 1.00 | infobox |
| 1521 | Ab urbe condita | 2274 | 1.00 | infobox |
| 1521 | Armenian calendar | 970 ԹՎ ՋՀ | 1.00 | infobox |
| 1521 | Assyrian calendar | 6271 | 1.00 | infobox |
| 1521 | Balinese saka calendar | 1442–1443 | 1.00 | infobox |
| 1521 | Bengali calendar | 927–928 | 1.00 | infobox |
| 1521 | Berber calendar | 2471 | 1.00 | infobox |
| 1521 | Buddhist calendar | 2065 | 1.00 | infobox |
| 1521 | Burmese calendar | 883 | 1.00 | infobox |
| 1521 | Byzantine calendar | 7029–7030 | 1.00 | infobox |
| 1521 | Chinese calendar | 庚辰年 (Metal Dragon) 4218 or 4011 — to — 辛巳年 (Metal Snake) 4219 or 4012 | 1.00 | infobox |
| 1521 | Coptic calendar | 1237–1238 | 1.00 | infobox |
| 1521 | Discordian calendar | 2687 | 1.00 | infobox |
| 1521 | English Regnal year | 12 Hen. 8 – 13 Hen. 8 | 1.00 | infobox |
| 1521 | Ethiopian calendar | 1513–1514 | 1.00 | infobox |
| 1521 | Gregorian calendar | 1521 MDXXI | 1.00 | infobox |
| 1521 | Hebrew calendar | 5281–5282 | 1.00 | infobox |
| 1521 | Holocene calendar | 11521 | 1.00 | infobox |
| 1521 | Igbo calendar | 521–522 | 1.00 | infobox |
| 1521 | Iranian calendar | 899–900 | 1.00 | infobox |
| 1521 | Islamic calendar | 927–928 | 1.00 | infobox |
| 1521 | Japanese calendar | Eishō 18 / Daiei 1 (大永元年) | 1.00 | infobox |
| 1521 | Javanese calendar | 1438–1439 | 1.00 | infobox |
| 1521 | Julian calendar | 1521 MDXXI | 1.00 | infobox |
| 1521 | Korean calendar | 3854 | 1.00 | infobox |
| 1521 | Minguo calendar | 391 before ROC 民前391年 | 1.00 | infobox |
| 1521 | Nanakshahi calendar | 53 | 1.00 | infobox |
| 1521 | Thai solar calendar | 2063–2064 | 1.00 | infobox |
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