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This article is about the year 891. For the number, see 891 (number).
|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|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1644|
|Chinese calendar||庚戌年 (Metal Dog)
3587 or 3527
— to —
辛亥年 (Metal Pig)
3588 or 3528
|- Vikram Samvat||947–948|
|- Shaka Samvat||813–814|
|- Kali Yuga||3992–3993|
|Japanese calendar||Kanpyō 3
|Minguo calendar||1021 before ROC
|Seleucid era||1202/1203 AG|
|Thai solar calendar||1433–1434|
- June – Death of the Abbasid regent, al-Muwaffaq. His son, al-Mu'tadid, is recognized as regent and second heir two days later, on 4 June, by his uncle, Caliph al-Mu'tamid.
- Arnulf of Carinthia defeats the Normans at the Battle of Leuven.
- April – Duke Guy of Spoleto is crowned Roman Emperor.
- The forces of Abdullah ibn Muhammad, Emir of Córdoba, defeat those of the rebel Umar ibn Hafsun at Poley in southern Spain.
- February 6 – Photius, Patriarch of Constantinople
- February 25 – Fujiwara no Mototsune, Japanese regent
- June 2 – Al-Muwaffaq, Abbasid regent
- September 14 – Pope Stephen V
- October 23 – Yazaman al-Khadim, Emir of Tarsus
- Isma'il ibn Bulbul, Abbasid vizier