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This article is about the year 1340.
|Centuries:||13th century – 14th century – 15th century|
|Decades:||1310s 1320s 1330s – 1340s – 1350s 1360s 1370s|
|Years:||1337 1338 1339 – 1340 – 1341 1342 1343|
|1340 by topic|
|State leaders - Sovereign states|
|Birth and death categories|
|Births - Deaths|
|Establishments and disestablishments categories|
|Establishments - Disestablishments|
|Art and literature|
|1340 in poetry|
|Ab urbe condita||2093|
|Bahá'í calendar||−504 – −503|
|English Regnal year||13 Edw. 3 – 14 Edw. 3|
|Chinese calendar||己卯年 (Earth Rabbit)
4036 or 3976
— to —
庚辰年 (Metal Dragon)
4037 or 3977
|- Vikram Samvat||1396–1397|
|- Shaka Samvat||1262–1263|
|- Kali Yuga||4441–4442|
|Japanese calendar||Ryakuō 3
|Minguo calendar||572 before ROC
|Thai solar calendar||1883|
|Wikimedia Commons has media related to 1340.|
- January 26 – King Edward III of England is declared King of France.
- April 8 – The Merinid galleys under the command of Muhammad ibn Ali al-Azafi rout the Castellan fleet off the coast of Algesiras.
- June 7 – Rotterdam is officially declared a city.
- June 24
- The Battle of Sluys is fought between the naval fleets of the Kingdom of England and the Kingdom of France. The former is under the command of Edward III of England and the latter under that of Admiral Hugues Quiéret and treasurer Nicholas Béhuchet assisted by Genoese mercenary galleys under Egidio Bocanegra. The French fleet is virtually destroyed and both of its commanders are killed.
- Valdemar IV of Denmark, son of deceased King Christopher II, is elected to the throne following 8 years of interregnum.
- September 25 – Hundred Years' War: Temporary Truce of Espléchin signed between England and France.
- October 30 – At the Battle of Río Salado in Spain, the kings of Castile and Portugal defeat the Nasrid ruler of Granada and his Moroccan allies.
- Europe has about 74 million inhabitants.
- March 5 – Cansignorio della Scala, Lord of Verona (d. 1375)
- March 6 – John of Gaunt, 1st Duke of Lancaster (d. 1399)
- October – Geert Groote, Dutch founder of the Brethren of the Common Life (d. 1384)
- November 30 – John, Duke of Berry, son of John II of France (d. 1416)
- date unknown
- March 31 – Ivan I of Moscow (b. 1288)
- April 5 – William Melton, English archbishop
- April 6 – Emperor Basil Megas Komnenos of Trebizond
- April 7 – Boleslaus George II of Halych (b. 1308), duke of Masovia
- December 2 – Geoffrey le Scrope, Chief Justice of King Edward III of England
- December 4 – Henry Burghersh, English bishop and chancellor (b. 1292)
- December 20 – John I, Duke of Bavaria (b. 1329)
- date unknown – Simonida, queen consort of Serbia (b. 1294)