| Millennium: | 1st millennium |
|---|---|
| Centuries: | 2nd century – 3rd century – 4th century |
| Decades: | 190s 200s 210s – 220s – 230s 240s 250s |
| Years: | 218 219 220 – 221 – 222 223 224 |
| 221 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 221 CCXXI |
| Ab urbe condita | 974 |
| Armenian calendar | N/A |
| Assyrian calendar | 4971 |
| Bahá'í calendar | -1623–-1622 |
| Bengali calendar | -372 |
| Berber calendar | 1171 |
| English Regnal year | N/A |
| Buddhist calendar | 765 |
| Burmese calendar | -417 |
| Byzantine calendar | 5729–5730 |
| Chinese calendar | 庚子年十一月二十日 (2857/2917-11-20) — to —
辛丑年十一月三十日(2858/2918-11-30) |
| Coptic calendar | -63–-62 |
| Ethiopian calendar | 213–214 |
| Hebrew calendar | 3981–3982 |
| Hindu calendars | |
| - Vikram Samvat | 277–278 |
| - Shaka Samvat | 143–144 |
| - Kali Yuga | 3322–3323 |
| Holocene calendar | 10221 |
| Iranian calendar | 401 BP – 400 BP |
| Islamic calendar | 413 BH – 412 BH |
| Japanese calendar | |
| Korean calendar | 2554 |
| Minguo calendar | 1691 before ROC 民前1691年 |
| Thai solar calendar | 764 |
Year 221 (CCXXI) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Gratus and Vitellius (or, less frequently, year 974 Ab urbe condita). The denomination 221 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.