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|Centuries:||13th century – 14th century – 15th century|
|Decades:||1340s 1350s 1360s – 1370s – 1380s 1390s 1400s|
|Years:||1374 1375 1376 – 1377 – 1378 1379 1380|
|1377 by topic|
|State leaders - Sovereign states|
|Birth and death categories|
|Births - Deaths|
|Establishments and disestablishments categories|
|Establishments - Disestablishments|
|Art and literature|
|1377 in poetry|
|Ab urbe condita||2130|
|English Regnal year||50 Edw. 3 – 1 Ric. 2|
— to —丁巳年十二月初一日
|- Vikram Samvat||1433–1434|
|- Shaka Samvat||1299–1300|
|- Kali Yuga||4478–4479|
|- Ǹrí Ìgbò||377–378|
|Juche calendar||N/A (before 1912)|
|Julian calendar||1377 MCCCLXXVII|
|Minguo calendar||535 before ROC
|Thai solar calendar||1920|
|Wikimedia Commons has media related to: 1377|
- January 17 – Pope Gregory XI moves the Papacy back from Avignon to Rome.
- January 27
- The Bad Parliament begins sitting in England. Influenced by Prince John of Gaunt, it undoes the work done by the Good Parliament, the previous year, to reduce corruption in the Royal Council. It also introduces a poll tax.
- Fourteen-year-old Maria of Sicily succeeds her father, Frederick III the Simple.
- February – The Pope's representative in northern Italy, Robert of Geneva (the future antipope Clement VII), pillages Cesena and 4,000 antipapal rebels are massacred.
- March 2 – The Bad Parliament dissolved.
- May 22 – Pope Gregory XI issues five Bulls condemning the opinion of John Wycliffe that Catholic priests should live in poverty like the twelve disciples of Jesus.
- July 16 – Coronation of 10-year-old Richard II, grandson of Edward III. A minority government was established and a series of continual councils ruled on his behalf until 1381.
- August – the Hongwu Emperor of the Ming Dynasty of China scraps the Office of Reports Inspection established in 1370 for a new Office of Transmission, in his efforts to create a more efficient communicatory system in the empire. A month before this he noted that anyone could send petitions to the throne; commoners often did, although the only times their petitions were read aloud to the emperor was when they called for the impeachment of local officials that were not up to par with their official duties.
- August 2 – Battle on Pyana River. The Russians are defeated, while their commander drowns in the river.
- October 13 – Richard II’s first parliament meets.
- October 26 – Coronation of Tvrtko I of Bosnia.
Date unknown 
- A sermon by a German monk states "the game of cards has come to us this year" and prohibitions against cards are issued by Prince John of Castile and the cities of Florence and Basel.
- Radu I succeeds Vladislav I as Prince of Wallachia (now southern Romania).
- The Trezzo sull'Adda Bridge is completed, and becomes the longest arch bridge in the world to be built for four centuries
- Sayf ad-Din Berkuk leads a revolt against the Mamluk Sultan of Egypt Alah-ad-Din Ali.
- Harihara II succeeds Bukka as ruler of the Vijayanagara Empire (now in southern India).
- Informed that Khan Urus of the White Horde has died, Timur of the Timurid Empire sends Tokhtamysh to take the Horde throne, but is defeated by Urus' son, Timur Malik.
- King U of Goryeo adopts the Ming calendar and begs to be invested by the Hongwu Emperor.
- Tran Hien succeeds Tran Kính as King of Vietnam.
- A rebellion against the Majapahit Empire is quashed in Sumatra.
- February 11 – King Ladislaus of Naples (d. 1414)
- May 2 – Oswald von Wolkenstein, Austrian poet (d. 1445)
- August 1 – Emperor Go-Komatsu of Japan (d. 1433)
- August 30 – Shah Rukh, ruler of Persia and Transoxonia (d. 1447)
- September 19 – Duke Albert IV of Austria (d. 1404)
- December 5 – Jianwen Emperor of China (d. 1402)
- date unknown
- January 27 – Frederick III the Simple, King of Sicily
- February 6 – Jeanne de Bourbon, queen of Charles V of France (b. 1338)
- March 16 – Marie de St. Pol, Countess of Pembroke and Foundress of Pembroke College, Cambridge
- April – Guillaume de Machaut, French poet and composer
- April 23 (or July 11 – Richardis of Schwerin, queen consort of Sweden (b. 1347)
- May – Algirdas, Grand Prince of Lithuania
- June 21 – King Edward III of England (b. 1312)
- December 1 – Magnus II, former King of Sweden (b. 1316)
- date unknown – Ibn Battuta, Moroccan explorer (b. 1304)