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|Centuries:||14th century – 15th century – 16th century|
|Decades:||1390s 1400s 1410s – 1420s – 1430s 1440s 1450s|
|Years:||1423 1424 1425 – 1426 – 1427 1428 1429|
|1426 by topic|
|Arts and science|
|Architecture - Art|
|State leaders - Sovereign states|
|Birth and death categories|
|Births - Deaths|
|Establishments and disestablishments categories|
|Establishments - Disestablishments|
|Art and literature|
|1426 in poetry|
|Ab urbe condita||2179|
|English Regnal year||4 Hen. 6 – 5 Hen. 6|
— to —丙午年十二月初三日
|- Vikram Samvat||1482–1483|
|- Shaka Samvat||1348–1349|
|- Kali Yuga||4527–4528|
|- Ǹrí Ìgbò||426–427|
|Japanese calendar||Ōei 33
|Juche calendar||N/A (before 1912)|
|Julian calendar||1426 MCDXXVI|
|Minguo calendar||486 before ROC
|Thai solar calendar||1969|
|Wikimedia Commons has media related to: 1426|
- March 6 – Battle of St. James (near Avranches): An English army under John, Duke of Bedford defeats the French under Arthur de Richemont, forcing the Duke of Brittany to recognize English suzerainty.
- June 16 – Hussite Wars – Battle of Usti nad Labem: The Hussites decisively beat the crusading armies in the Fourth Anti-Hussite Crusade.
- July 7 – The Battle of Chirokitia is fought.
Date unknown 
- "Castello Orsini-Odescalchi" is built in Bracciano, Italy by the Orsini family.
- Eunuch-dominated secret police start to control the palace guards and imperial workshops, infiltrate the civil service and head all foreign missions in China.
- February – Christian of Oldenburg, King of Denmark 1448–1481, of Norway 1450–1481 and of Sweden 1457–1464 (d. 1481)
- July 13 – Anne Neville, Countess of Warwick (d. 1492)
- date unknown – John II, Duke of Bourbon (d. 1488)
- November 24 – Elizabeth Plantagenet, daughter of John of Gaunt
- December – Pipo of Ozora, Hungarian military leader
- December 31 – Thomas Beaufort, 1st Duke of Exeter (b. c. 1377)
- date unknown – Tezozomoc, Tepanec ruler of Azcapotzalco