Year 1418 (MCDXVIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.

• January 31 – Mircea I of Wallachia is succeeded by Michael I of Wallachia.
• April 22 – The Council of Constance ends.^[1]
• May 29 – John the Fearless, Duke of Burgundy, captures Paris.

• July – The English Siege of Rouen begins.^[2]

• September 18 – King Taejong (r. 1400-1418) of the Joseon dynasty abdicates the throne. King Sejong ascends to the throne.

• João Gonçalves Zarco leads one of the first Portuguese expeditions to the Madeira Islands.

• January 9 – Juan Ramón Folch III de Cardona, Aragonese admiral (d. 1485)
• March 14 – Philip II, Count of Nassau-Weilburg (1429–1492) (d. 1492)
• April 20 – Earl David of Rookwood
• May 16 – John II of Cyprus, King of Cyprus and Armenia and also titular King of Jerusalem from 1432 to 1458 (d. 1458)
• August 5 – Malatesta Novello, Italian condottiero (d. 1465)
• September 24 – Anne of Cyprus, Italian noble (d. 1462)
• November 2 – Gaspare Nadi, Italian builder famous for his diary (diario) (d. 1504)
• November 20 – Robert de Morley, 6th Baron Morley, Lord of Morley Saint Botolph (d. 1442)
• December 8 – Queen Jeonghui, Queen consort of Korea (d. 1483)
• December 12 – Archduke Albert VI of Austria (d. 1463)
• date unknown – Peter II, Duke of Brittany (d. 1457)
  • Isotta Nogarola, Italian writer and intellectual (d. 1466)

• January 31 – Mircea I of Wallachia, ruler of Wallachia (b. 1355)
• March 22 – Dietrich of Nieheim, German historian
• June 2 – Katherine of Lancaster, queen of Henry III of Castile
• June 12 – Bernard VII, Count of Armagnac, Constable of France (b. 1360)
• November 25 – Henry Beaufort, 2nd Earl of Somerset (b. 1401)
• December 11 – Louis of Piedmont (b. 1364)
• date unknown
  • Ixtlilxochitl I, ruler of the Mesoamerican city-state of Texcoco, and ally of the Aztecs.^[3]
  • Foelke Kampana, Frisian lady and regent (b. 1355)