| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 860s 870s 880s – 890s – 900s 910s 920s |
| Years: | 888 889 890 – 891 – 892 893 894 |
| 891 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 891 DCCCXCI |
| Ab urbe condita | 1644 |
| Armenian calendar | 340 ԹՎ ՅԽ |
| Assyrian calendar | 5641 |
| Bahá'í calendar | -953–-952 |
| Bengali calendar | 298 |
| Berber calendar | 1841 |
| English Regnal year | N/A |
| Buddhist calendar | 1435 |
| Burmese calendar | 253 |
| Byzantine calendar | 6399–6400 |
| Chinese calendar | 庚戌年十一月十七日 (3527/3587-11-17) — to —
辛亥年十一月廿七日(3528/3588-11-27) |
| Coptic calendar | 607–608 |
| Ethiopian calendar | 883–884 |
| Hebrew calendar | 4651–4652 |
| Hindu calendars | |
| - Vikram Samvat | 947–948 |
| - Shaka Samvat | 813–814 |
| - Kali Yuga | 3992–3993 |
| Holocene calendar | 10891 |
| Iranian calendar | 269–270 |
| Islamic calendar | 277–278 |
| Japanese calendar | |
| Korean calendar | 3224 |
| Minguo calendar | 1021 before ROC 民前1021年 |
| Thai solar calendar | 1434 |
Year 891 (DCCCXCI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.