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|Ab urbe condita||2140|
|Balinese saka calendar||1308–1309|
|English Regnal year||10 Ric. 2 – 11 Ric. 2|
|Chinese calendar||丙寅年 (Fire Tiger)|
4083 or 4023
— to —
丁卯年 (Fire Rabbit)
4084 or 4024
|- Vikram Samvat||1443–1444|
|- Shaka Samvat||1308–1309|
|- Kali Yuga||4487–4488|
|Japanese calendar||Shitoku 4 / Kakei 1|
|Minguo calendar||525 before ROC|
|Thai solar calendar||1929–1930|
1513 or 1132 or 360
— to —
1514 or 1133 or 361
|Wikimedia Commons has media related to 1387.|
- January – Sigismund, the future Holy Roman Emperor and husband of Mary, Queen of Hungary, orders the murder of her mother-in-law, Elizabeta Kotromanic, and declares himself joint ruler of Hungary.
- January 1 – Charles III ascends to the throne of Navarre, after the death of his father, Charles II.
- January 5 – John I succeeds his father, Peter IV, as King of Aragon and Valencia, and forms an alliance with France and Castile.
- March 11 – Battle of Castagnaro: Padua, led by John Hawkwood, is victorious over Giovanni Ordelaffi of Verona.
- March 24 - 25 – English victory over a Franco-Castilian-Flemish fleet in the Battle of Margate off the coast of Margate.
- June 2 – John Holland, a maternal half-brother of Richard II of England, is created Earl of Huntingdon.
- August 22 – Olaf, King of Norway and Denmark and claimant to the throne of Sweden, dies. The vacant thrones come under the regency of his mother Margaret I of Denmark, who will soon become queen in her own right.
- September 27 – Petru of Moldavia pays homage to Władysław II Jagiełło, making Moldavia a Polish fief (which it will remain until 1497).
- December 19 – Battle of Radcot Bridge: Forces loyal to Richard II of England are defeated by a group of rebellious barons known as the Lords Appellant. Richard II is imprisoned until he agrees to replace all the councillors in his court.
- Timur conquers the Muzaffarid Empire in central Persia, and appoints three puppet rulers.
- Khan Tokhtamysh of the Golden Horde invades the Timurid Empire, but has to withdraw soon after, due to heavy snow.
- Magha II succeeds his brother, Musa II, as Mansa of the Mali Empire.
- January – Elizabeth of Bosnia, regent of Hungary
- January 1 – King Charles II of Navarre (b. 1332)
- January 6 – Peter IV of Aragon (b. 1319)
- July 20 – Robert IV of Artois, Count of Eu (poisoned) (b. 1356)
- July 22 – Frans Ackerman, Flemish statesman (b. 1330)
- August 23 – King Olaf IV of Norway/Olaf II of Denmark (b. 1370)
- date unknown
- Woodward, Bernard Bolingbroke; Cates, William Leist Readwin (1872). Encyclopaedia of Chronology: Historical and Biographical. Lee and Shepard. p. 313.
- "Charles II | king of Navarre". Encyclopedia Britannica. Retrieved March 21, 2019.