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|Centuries:||8th century – 9th century – 10th century|
|Decades:||810s 820s 830s – 840s – 850s 860s 870s|
|Years:||840 841 842 – 843 – 844 845 846|
|843 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1596|
|Bahá'í calendar||-1001 – -1000|
|English Regnal year||N/A|
|Chinese calendar||壬戌年 (Water Dog)
3539 or 3479
— to —
癸亥年 (Water Pig)
3540 or 3480
|- Vikram Samvat||899–900|
|- Shaka Samvat||765–766|
|- Kali Yuga||3944–3945|
|Igbo calendar||-157 – -156|
|Japanese calendar||Jōwa 10
|Minguo calendar||1069 before ROC
|Thai solar calendar||1386|
|Wikimedia Commons has media related to 843.|
- August – The Treaty of Verdun divides the Carolingian Empire between the 3 sons of Louis the Pious (Charles the Bald, Lothar and Louis the German).
- Kenneth I (Cináed mac Ailpín), King of the Scots, also becomes King of the Picts, thus becoming the first monarch of the new nation of Scotland. The Alpin dynasty of Scottish kings begins to reign.
- The Battle of Messac is won by Erispoe, son of Nominoe, Count of Vannes, against Renaud d'Herbauges who is prefet of the Marks of Brittany. Renaud d'Herbauges had tried an attack while Nominoe was ill. This battle marks the beginning of the hostilities between Charles the Bald and Nominoe.
- Al-Andalus: The city of Saragossa rises against the Umayyad emir.
- Byzantine Empire: Official end of Iconoclasm and a return to images in all Orthodox churches of the Empire. To commemorate this, on the first Sunday in Lent the Feast of Orthodoxy is celebrated every year since then.
- Crete: A major Byzantine attempt at recovering the island from the Saracens is launched. After initial success, the Byzantine army is overwhelmed.
- In the Tang Dynasty Chinese capital of Chang'an, a large fire consumes 4,000 homes, warehouses, and other buildings in the East Market, yet the rest of the city is at a safe distance from the blaze (which is largely quarantined in East Central Chang'an thanks to the large width of roads in Chang'an that produce fire breaks).
- The iconoclastic controversies end in Byzantium with the widow of Emperor Theophilus, Theodora II, acting as regent for her son, the future Michael III. Theodora II restored the veneration of icons in the Eastern Church, thus ending Iconoclasm.