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|857 by topic|
|Ab urbe condita||1610|
|Balinese saka calendar||778–779|
|Chinese calendar||丙子年 (Fire Rat)
3553 or 3493
— to —
丁丑年 (Fire Ox)
3554 or 3494
|- Vikram Samvat||913–914|
|- Shaka Samvat||778–779|
|- Kali Yuga||3957–3958|
|Japanese calendar||Saikō 4 / Ten'an 1
|Minguo calendar||1055 before ROC
|Seleucid era||1168/1169 AG|
|Thai solar calendar||1399–1400|
983 or 602 or −170
— to —
984 or 603 or −169
|Wikimedia Commons has media related to 857.|
- Emperor Michael III, under the influence of his uncle Bardas, banishes his mother Theodora to the Gastria Monastery. Bardas, the de facto regent, becomes the most powerful person in the Byzantine Empire.
- November – Erispoe, ruler (duke) of Brittany, is assassinated by his cousin Salomon and followers, in the church at Talensac. King Charles the Bald acknowledges Salomon as the rightful 'king' of Brittany.
- A Danish Viking fleet raids the cities of Dorestad, Paris and Orléans. Others sail up the Oise River, ravaging Beauvais and the abbey of Saint-Germer-de-Fly (approximate date).
- Viking chieftain Rorik, with the agreement of King Lothair II, leaves Dorestad with a fleet and forces his rival Horik II to recognise him as ruler over Denmark (approximate date).
- The first recorded major outbreak of ergotism kills thousands of people in the Rhine Valley. They have eaten bread made from rye infected with the ergot fungus parasite Claviceps purpurea (approximate date).
- Dae Ijin, king of Balhae (Korea)
- Erispoe, king (duke) of Brittany
- Harith al-Muhasibi, Muslim teacher (b. 781)
- Hilderic of Farfa, Frankish abbot
- Kim Yang, viceroy of Silla (Korea) (b. 808)
- Masawaiyh, Assyrian physician
- Matudán mac Muiredaig, king of Ulaid (Ireland)
- Ma Zhi, chancellor of the Tang Dynasty
- Munseong, king of Silla (Korea)
- Roderick, Spanish priest and saint
- Wang Shaoding, Chinese governor (jiedushi)
- Yahya ibn Aktham, Muslim jurist
- Zheng Lang, chancellor of the Tang Dynasty
- Ziryab, Muslim poet and musician (b. 789)
- Treadgold 1997, pp. 450–451.