1379 (MCCCLXXIX) was a common year starting on Saturday of the Julian calendar, the 1379th year of the Common Era (CE) and Anno Domini (AD) designations, the 379th year of the 2nd millennium, the 79th year of the 14th century, and the 10th and last year of the 1370s decade. As of the start of 1379, the Gregorian calendar was 8 days ahead of the Julian calendar, which was the dominant calendar of the time.

• September 9 – Treaty of Neuberg signed, splitting the Austrian Habsburg lands between brothers Albert III and Leopold III. Albert III retains the title of Duke of Austria.
• The Venetians and Ottomans invade Constantinople and restore John V Palaiologos as Byzantine co-emperor. Andronikos IV Palaiologos is allowed to remain as Byzantine co-emperor but is confined to the city of Silivri for the remainder of his life.
• John I succeeds his father, Henry II, as King of Castile and King of León.
• Bairam Khawaja establishes the independent principality of the Turkomans of the Black Sheep Empire in present-day Armenia.
• Dmitri Donskoi of Moscow raids Estonia.
• Foundation of New College, Oxford.
• Foundation of Wisbech Grammar School in England.

• October 4 – King Henry III of Castile (died 1406)
• Ferdinand I of Aragon (died 1416)
• Joan Beaufort, Countess of Westmoreland (approximate date; died 1440)

• February 18 – Albert II of Mecklenburg
• May 29 – King Henry II of Castile (born 1334)
• December 16 – John Fitzalan, Marshal of England (drowned)
• Aqsara'i, Persian physician