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1343 in various calendars
Gregorian calendar	1343; MCCCXLIII
Ab urbe condita	2096
Armenian calendar	792; ԹՎ ՉՂԲ
Assyrian calendar	6093
Balinese saka calendar	1264–1265
Bengali calendar	750
Berber calendar	2293
English Regnal year	16 Edw. 3 – 17 Edw. 3
Buddhist calendar	1887
Burmese calendar	705
Byzantine calendar	6851–6852
Chinese calendar	壬午年 (Water Horse); 4040 or 3833; — to —; 癸未年 (Water Goat); 4041 or 3834
Coptic calendar	1059–1060
Discordian calendar	2509
Ethiopian calendar	1335–1336
Hebrew calendar	5103–5104
Hindu calendars
- Vikram Samvat	1399–1400
- Shaka Samvat	1264–1265
- Kali Yuga	4443–4444
Holocene calendar	11343
Igbo calendar	343–344
Iranian calendar	721–722
Islamic calendar	743–744
Japanese calendar	Kōei 2; (康永２年)
Javanese calendar	1255–1256
Julian calendar	1343; MCCCXLIII
Korean calendar	3676
Minguo calendar	569 before ROC; 民前569年
Nanakshahi calendar	−125
Thai solar calendar	1885–1886
Tibetan calendar	阳水马年; (male Water-Horse); 1469 or 1088 or 316; — to —; 阴水羊年; (female Water-Goat); 1470 or 1089 or 317

Millennium:	2nd millennium
Centuries:	13th century; 14th century ; 15th century;
Decades:	1320s; 1330s; 1340s ; 1350s; 1360s;
Years:	1340; 1341; 1342; 1343 ; 1344; 1345; 1346;

Year 1343 (MCCCXLIII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.

Events

January 14 – Arnošt of Pardubice becomes the last bishop of Prague and, subsequently, the first Archbishop of Prague.
January 27 – Pope Clement VI issues his bull Unigenitus, defining the doctrine of "The Treasury of Merits" or "The Treasury of the Church" as the basis for the issuance of indulgences by the Catholic Church.
April 23 – The St. George's Night Uprising begins in Estonia.
May 4 – St. George's Night Uprising: The "Four Estonian kings" are murdered, at the negotiations with the Livonian Order.
August 15 – Magnus IV of Sweden abdicates from the throne of Norway, in favor of his son Haakon VI of Norway. However, Haakon is still a minor, allowing Magnus to remain de facto ruler.
August 31 – A naval league is formed between the Pope, the Republic of Venice, the Knights Hospitaller and the Kingdom of Cyprus, to prepare the Smyrniote Crusades.^[1]
November 25 – A tsunami, caused by an earthquake, devastates the Maritime Republic of Amalfi, among other places.

^ Lock, Peter (2013). The Routledge Companion to the Crusades. Routledge. p. 127. ISBN 9781135131371.
^ Grant, Alexander. "Alexander Stewart", ODNB.