| Centuries: | 4th century · 5th century · 6th century |
| Decades: | 370s 380s 390s 400s 410s 420s 430s |
| Years: | 399 400 401 402 403 404 405 |
| 402 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 402 CDII |
| Ab urbe condita | 1155 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1442 – -1441 |
| Bengali calendar | -191 |
| Berber calendar | 1352 |
| Buddhist calendar | 946 |
| Burmese calendar | -236 |
| Byzantine calendar | 5910 – 5911 |
| Chinese calendar | 辛丑年十一月十二日 (3038/3098-11-12) — to —
壬寅年十一月廿一日(3039/3099-11-21) |
| Coptic calendar | 118 – 119 |
| Ethiopian calendar | 394 – 395 |
| Hebrew calendar | 4162 – 4163 |
| Hindu calendars | |
| - Bikram Samwat | 458 – 459 |
| - Shaka Samvat | 324 – 325 |
| - Kali Yuga | 3503 – 3504 |
| Holocene calendar | 10402 |
| Iranian calendar | 220 BP – 219 BP |
| Islamic calendar | 227 BH – 226 BH |
| Japanese calendar | |
| Korean calendar | 2735 |
| Thai solar calendar | 945 |