| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 820s 830s 840s – 850s – 860s 870s 880s |
| Years: | 855 856 857 – 858 – 859 860 861 |
| 858 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 858 DCCCLVIII |
| Ab urbe condita | 1611 |
| Armenian calendar | 307 ԹՎ ՅԷ |
| Bahá'í calendar | -986 – -985 |
| Bengali calendar | 265 |
| Berber calendar | 1808 |
| Buddhist calendar | 1402 |
| Burmese calendar | 220 |
| Byzantine calendar | 6366 – 6367 |
| Chinese calendar | 丁丑年十二月十三日 (3494/3554-12-13) — to —
戊寅年十一月廿三日(3495/3555-11-23) |
| Coptic calendar | 574 – 575 |
| Ethiopian calendar | 850 – 851 |
| Hebrew calendar | 4618 – 4619 |
| Hindu calendars | |
| - Bikram Samwat | 914 – 915 |
| - Shaka Samvat | 780 – 781 |
| - Kali Yuga | 3959 – 3960 |
| Holocene calendar | 10858 |
| Iranian calendar | 236 – 237 |
| Islamic calendar | 243 – 244 |
| Japanese calendar | |
| Korean calendar | 3191 |
| Thai solar calendar | 1401 |