| Centuries: | 5th century · 6th century · 7th century |
| Decades: | 490s 500s 510s 520s 530s 540s 550s |
| Years: | 520 521 522 523 524 525 526 |
| 523 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 523 DXXIII |
| Ab urbe condita | 1276 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1321 – -1320 |
| Bengali calendar | -70 |
| Berber calendar | 1473 |
| Buddhist calendar | 1067 |
| Burmese calendar | -115 |
| Byzantine calendar | 6031 – 6032 |
| Chinese calendar | 壬寅年十一月廿九日 (3159/3219-11-29) — to —
癸卯年十二月初九日(3160/3220-12-9) |
| Coptic calendar | 239 – 240 |
| Ethiopian calendar | 515 – 516 |
| Hebrew calendar | 4283 – 4284 |
| Hindu calendars | |
| - Bikram Samwat | 579 – 580 |
| - Shaka Samvat | 445 – 446 |
| - Kali Yuga | 3624 – 3625 |
| Holocene calendar | 10523 |
| Iranian calendar | 99 BP – 98 BP |
| Islamic calendar | 102 BH – 101 BH |
| Japanese calendar | |
| Korean calendar | 2856 |
| Thai solar calendar | 1066 |