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Year 1376 (MCCCLXXVI) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar.
- 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.