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|Ab urbe condita||2129|
|Balinese saka calendar||1297–1298|
|English Regnal year||49 Edw. 3 – 50 Edw. 3|
|Chinese calendar||乙卯年 (Wood Rabbit)|
4072 or 4012
— to —
丙辰年 (Fire Dragon)
4073 or 4013
|- Vikram Samvat||1432–1433|
|- Shaka Samvat||1297–1298|
|- Kali Yuga||4476–4477|
|Japanese calendar||Eiwa 2|
|Minguo calendar||536 before ROC|
|Thai solar calendar||1918–1919|
1502 or 1121 or 349
— to —
1503 or 1122 or 350
|Wikimedia Commons has media related to 1376.|
- March – The peace treaty between England and France is extended until April, 1377.
- March 31 – Pope Gregory XI excommunicates all members of the government of Florence, and places the city under an interdict.
- April 28 – The Good Parliament begins in England (so called because its members attempted to reform the corrupt Royal Council on that date).
- May 3 – Olav IV Haakonsson is elected King Oluf II of Denmark, following the death of his grandfather, Valdemar IV, in 1375.
- June – Catherine of Siena visits Pope Gregory XI in Avignon, to attempt to persuade him to make peace with Florence, and move the Papacy back to Rome.
- June 7 – The dying Prince Edward summons his father, Edward III, and brother, John of Gaunt, and makes them swear to uphold the claim to the throne of his son Richard; Edward is the first "English" Prince of Wales not to become King of England.
- July 10 – The Good Parliament is dissolved (at that time, it was the longest Parliament to have sat in England).
- August 12 – With the help of the Genoese, Byzantine co-emperor Andronicus IV Palaeologus invades Constantinople and dethrones his father, John V Palaeologus, as co-emperor. John V Palaeologus is taken prisoner.
- September – John of Gaunt summons religious reformer John Wyclif to appear before the Royal Council.
- November 20 – Richard of Bordeaux, son of the Black Prince, is created Prince of Wales in succession to his father.
- December 25 – John of Gaunt presents his nephew, Richard of Bordeaux, to the feudatories of the realm and swears to uphold Richard's right to succeed Edward III.
- January 24 – Richard FitzAlan, 10th Earl of Arundel, English military leader
- April 6 – Preczlaw of Pogarell, Cardinal and Bishop of Wrocław (b. 1310)
- May 30 – Joan of Ponthieu, Dame of Epernon, French countess regent
- June 8 – Edward, the Black Prince, son of King Edward III of England (b. 1330)
- July 22 – Simon Langham, Archbishop of Canterbury (b. 1310)