21 AD
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | AD 21 XXI |
| Ab urbe condita | 774 |
| Assyrian calendar | 4771 |
| Bengali calendar | −572 |
| Berber calendar | 971 |
| Buddhist calendar | 565 |
| Burmese calendar | −617 |
| Byzantine calendar | 5529–5530 |
| Chinese calendar |
庚辰年 (Metal Dragon) 2717 or 2657 — to — 辛巳年 (Metal Snake) 2718 or 2658 |
| Coptic calendar | −263 – −262 |
| Discordian calendar | 1187 |
| Ethiopian calendar | 13–14 |
| Hebrew calendar | 3781–3782 |
| Hindu calendars | |
| - Vikram Samvat | 77–78 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3121–3122 |
| Holocene calendar | 10021 |
| Iranian calendar | 601 BP – 600 BP |
| Islamic calendar | 619 BH – 618 BH |
| Javanese calendar | N/A |
| Julian calendar | AD 21 XXI |
| Korean calendar | 2354 |
| Minguo calendar | 1891 before ROC 民前1891年 |
| Nanakshahi calendar | −1447 |
| Seleucid era | 332/333 AG |
| Thai solar calendar | 563–564 |
AD 21 (XXI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Caesar (or, less frequently, year 774 Ab urbe condita). The denomination AD 21 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.
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