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|1440 by topic|
|Arts and science|
|Architecture - Art|
|Political entities - State leaders - Religious leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1440 in poetry|
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- February 21 – The Prussian Confederation is formed.
- April 9 – Christopher of Bavaria is elected King of Denmark.
- April – Murad II lays siege to Belgrade. The city is heavily damaged, but the defenders' use of artillery prevents the Turks from capturing the city.
- September 13 – Gilles de Rais is taken into custody, upon an accusation brought against him by the Bishop of Nantes.
- September – The term of Regent of Sweden Karl Knutsson Bonde ends, as newly elected king of Denmark Christopher of Bavaria is also elected king of Sweden.
- October 22 – Gilles de Rais confesses and is sentenced to death.
- Itzcóatl, Aztec ruler of Tenochtitlan, dies and is succeeded by Moctezuma I (Moctezuma Ilhuicamina).
- Lorenzo Valla's De falso credita et ementita Constantini Donatione declamatio demonstrates that the Donation of Constantine is a forgery.
- Eton College is founded by Henry VI of England.
- Sir Richard Molyneux is appointed constable of Liverpool Castle, in England.
- The Ming Dynasty government of China begins a decade-long series of issuing harsh edicts towards those who illegally mine silver, the latter known as 'miner bandits' (kuangzei), a trend begun in 1438. The government wants to cap the amount of silver circulating into the market, as more grain taxes are converted into silver taxes. The government establishes community night watches known as 'watches and tithings' (baojia), who ensure that illegal mining activities are brought to a halt. However, these are desperate measures, as illegal silver mining continues to thrive as a dangerous but lucrative venture.
- Zhu Quan writes the Cha Pu ("Tea manual") in China.
- January 22 – Ivan III of Russia (d. 1505)
- February 13 – Hartmann Schedel, German physician (d. 1514)
- date unknown – Clara Tott, German court singer (d. 1520)
- March 9 – St. Frances of Rome, Italian nun (b. 1384)
- March 20 – Sigismund I of Lithuania
- April 1 or April 2 – Giovanni Vitelleschi, Italian bishop and soldier
- April 6 – Henry Wardlaw, Scottish church leader
- September 20 – Frederick I, Elector of Brandenburg (b. 1371)
- September 30 – Reginald Grey, 3rd Baron Grey de Ruthyn, English soldier and politician
- October 12 – Ginevra d'Este (b. 1419)
- October 26 – Gilles de Rais, French soldier (b. 1404)
- November 13 – Joan Beaufort, Countess of Westmoreland
- date unknown – Itzcóatl, Aztec ruler of Tenochtitlan