List of state leaders in 1255
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This is a list of heads of state, government leaders, and other rulers in the year 1255.
Asia
- China (Southern Song dynasty) - Emperor Lizong (1224–1264)
- Korea (Goryeo Kingdom) – Gojong (1213–1259)
- Japan (Kamakura period)
- Monarch – Emperor Go-Fukakusa (1246–1260)
- Kamakura shogunate - Prince Munetaka (1252–1266)
- Shikken - Hōjō Tokiyori (1246–1256)
- Khmer Empire – Jayavarman VIII (1243–1295)
- Mongol Empire – Möngke Khan (1251–1260)
- Pagan Kingdom – Narathihapate (1254–1287)
- Sukhothai Kingdom – Sri Indraditya (1249–1257)
Europe
- Principality of Achaea – William II of Villehardouin (1246–1278)
- County of Angoulême – Hugh II (1249–1260)
- Kingdom of Aragon – James I (1213–1276)
- Kingdom of Bohemia – Ottokar II (1253–1278)
- Duchy of Brittany – John I (1237–1286)
- Bulgarian Empire – Michael II Asen, Tsar of Bulgaria (1246–1256)
- Crown of Castile – Alfonso X (1252–1284)
- County of Champagne – Theobald V (1253–1270)
- Kingdom of Denmark – Christopher I (1252–1259)
- Kingdom of England – Henry III (1216–1272)
- County of Flanders – Margaret II (1244–1278)
- Kingdom of France – Louis IX (1226–1270)
- Kingdom of Gwynedd – Llywelyn ap Gruffudd (1246–1282)
- Holy Roman Empire – William (1254–1256)
- Kingdom of Hungary – Béla IV (1235–1270)
- Kingdom of Lithuania – Mindaugas (1253–1263)
- Kingdom of Navarre – Theobald II (1253–1270)
- Kingdom of Norway – Haakon IV (1217–1263)
- Duchy of Poland – Bolesław V the Chaste, High Duke of Poland (1243–1279)
- Kingdom of Portugal and the Algarves – Afonso III (1249–1279)
- Kingdom of Scotland – Alexander III (1249–1286)
- Kingdom of Sweden
- Monarch – Valdemar I (1250–1275)
- Regent – Birger Jarl, regent of Sweden (1250–1266)
Middle East and North Africa
- Almohad Caliphate – Umar, Almohad Caliph (1248–1266)
- Principality of Antioch – Bohemond VI (1252–1268)
- Armenian Kingdom of Cilicia – Hethum I (1226–1270)
- Kingdom of Cyprus – Hugh II (1253–1267)
- Sultanate of Damascus – An-Nasir Yusuf (1250–1260)
- Mamluk Sultanate of Egypt – Aybak (1254–1257)
- Sultanate of Rûm – Kaykaus II (1246–1262)
- Empire of Trebizond – Manuel I (1238–1263)