| Centuries: | 4th century · 5th century · 6th century |
| Decades: | 390s 400s 410s 420s 430s 440s 450s |
| Years: | 421 422 423 424 425 426 427 |
| 424 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 424 CDXXIV |
| Ab urbe condita | 1177 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1420 – -1419 |
| Bengali calendar | -169 |
| Berber calendar | 1374 |
| Buddhist calendar | 968 |
| Burmese calendar | -214 |
| Byzantine calendar | 5932 – 5933 |
| Chinese calendar | 癸亥年十一月十四日 (3060/3120-11-14) — to —
甲子年十一月廿五日(3061/3121-11-25) |
| Coptic calendar | 140 – 141 |
| Ethiopian calendar | 416 – 417 |
| Hebrew calendar | 4184 – 4185 |
| Hindu calendars | |
| - Bikram Samwat | 480 – 481 |
| - Shaka Samvat | 346 – 347 |
| - Kali Yuga | 3525 – 3526 |
| Holocene calendar | 10424 |
| Iranian calendar | 198 BP – 197 BP |
| Islamic calendar | 204 BH – 203 BH |
| Japanese calendar | |
| Korean calendar | 2757 |
| Thai solar calendar | 967 |