|Centuries:||14th century – 15th century – 16th century|
|Decades:||1390s 1400s 1410s – 1420s – 1430s 1440s 1450s|
|Years:||1420 1421 1422 – 1423 – 1424 1425 1426|
|Ab urbe condita||2176|
|Balinese saka calendar||1344–1345|
|English Regnal year||1 Hen. 6 – 2 Hen. 6|
|Chinese calendar||壬寅年 (Water Tiger)|
4119 or 4059
— to —
癸卯年 (Water Rabbit)
4120 or 4060
|- Vikram Samvat||1479–1480|
|- Shaka Samvat||1344–1345|
|- Kali Yuga||4523–4524|
|Japanese calendar||Ōei 30|
|Minguo calendar||489 before ROC|
|Thai solar calendar||1965–1966|
1549 or 1168 or 396
— to —
1550 or 1169 or 397
- April 27 – Hussite Wars: Battle of Horic – The Taborites decisively beat the Utraquists.
- July 31 – Hundred Years' War: Battle of Cravant – The French army is defeated at Cravant on the banks of the river Yonne.
- August 23 – English with Burgundian soldiers defeat the French, who were supported by the Scots, at Verneuil. The English-Burgundian alliance was strengthened by the marriage of the Duke of Bedford to Anne of Burgundy. Anne was sister of Philip the Good, Duke of Burgundy. Philip the Good had allied Burgundy with England after his father was murdered in 1419 by the French Dauphin, son of Charles VI of France.
- According to the 1421 theory, the return of Zheng He's fleets to China.