List of state leaders in 865

864 state leaders - Events of 865 - 866 state leaders - State leaders by year

Asia

China (Tang Dynasty) - Yizong, Emperor of Tang China (859–873)
Gurjara - Mihira Bhoja I, Pratihara King of Gurjara (c. 836–886)
Japan - Emperor Seiwa, emperor of Japan (858–876)
Korea (North South States Period)
- Balhae - Dae Geonhwang, King of Balhae (857–871)
- Silla - Gyeongmun, King of Silla (861–875)

Europe

Bulgaria - Boris I, Knyaz of Bulgaria (852–889)
Byzantine Empire - Michael III (842–867)
Caucasus
- Principate of Iberia - Bagrat I Kuropalates, Prince of Iberia (830–876)
- Principality of Kakheti - Gabriel, Prince of Kakheti (861–881)
Littoral Croatia - Domagoj, Duke of Littoral Croatia (864–876)
Kingdom of Denmark - Horik II (854–c. 866)
England (Heptarchy) -
- Kingdom of East Anglia - Edmund the Martyr (854–869)
- Mercia - Burgred, King of Mercia (852–874)
- Northumbria - Ælla, King of Northumbria (862/863–867)
- Wessex -
  1. Æthelbert, King of Wessex (860–865)
  2. Æthelred, King of Wessex (865–871)
East Francia - Louis the German, King of East Francia (843–876)
- Duchy of Saxony - Liudolf, Duke of Saxony (844–866)
- Thuringia - Thakulf, Duke of Thuringia (849–873)
West Francia - Charles the Bald, King of West Francia (843–877)
- County of Angoulême - Emenon (863–866)
- Anjou - Robert the Strong, Count of Anjou (861–866)
- Duchy of Aquitaine - Ranulf I, Duke of Aquitaine (854–866)
- Kingdom of Aquitaine - Charles the Child, King of Aquitaine (855–866)
- County of Auxerre - Robert the Strong (864–866)
- Barcelona -
  1. Humfrid, Count of Barcelona (858–865)
  2. Bernard II, Count of Barcelona (865–878)
- Duchy of Brittany - Salomon (857–874)
- County of Flanders - Baldwin I (862–879)
- County of Maine -
  1. Rorgon II (853–865)
  2. Gosfrid (865–878)
- March of Neustria -
  1. - Adalard the Seneschal (861–865)
    - Udo (861–865)
    - Berengar I (861–865)
  2. Gosfrid of Maine (865–878)
- Poitiers - Ranulf I, Count of Poitiers (854–866)
- County of Toulouse -
  1. Humfrid, Count of Toulouse (863–865)
  2. Bernard II, Count of Toulouse (865–877)
- Tours - Robert the Strong, Count of Tours (860–866)
- Troyes - Rudolph I, Count of Troyes (858–866)
- Urgell - Solomon, Count of Urgell (848–869)
Gascony - Sans III Mitarra, Duke of Gascony (864–893)
Ireland - Áed Findliath, High King of Ireland (862–879)
- Ailech - Áed Findliath, King of Ailech (c. 855–879)
- Connacht - Mugron mac Máel Cothaid, King of Connacht (848–872)
- Hy-Many -
- Leinster - Dúnlaing mac Muiredaig, King of Leinster (863–869)
- Mide - Donnchad mac Aedacain, King of Mide (864–877)
- Munster - Cenn Fáelad hua Mugthigirn, King of Munster (861–872)
- Osraige - Cerball mac Dúnlainge, King of Osraige (842–888)
- Ulaid -
- Cathalán mac Indrechtaig, Co-king of Ulaid (857–871)
- Lethlobar mac Loingsig, Co-king of Ulaid (857–873)
Italy - Louis II, King of Italy and Holy Roman Emperor (855–875)
- Principality of Benevento - Adelchis, Prince of Benevento (854–878)
- County of Capua - Landulf II (863–879)
- March of Friuli - Unruoch III (863–874)
- Duchy of Gaeta - Constantine, Hypatus of Gaeta (839–866)
- Duchy of Naples - Gregory III (864–870)
- Papal States - Pope Nicholas I (858–867)
- Principality of Salerno - Guaifer (861–880)
- Duchy of Spoleto - Lambert I (860–871)
- March of Tuscany - Adalbert I (847–886)
- Venice - Orso I Participazio, Doge of Venice (864–881)
Lotharingia - Lothair II, King of Lotharingia (855–869)
Great Moravia - Rastislav, Prince of Great Moravia (846–870)
Novgorod - Rurik, Prince of Novgorod (862–879)
Scotland
- Picts - Constantine I, King of the Picts (862–877)
Serbia - Mutimir, Grand Zhupan of Serbia (850–891)
Spain -
- County of Aragon - Galindo Aznárez I (844–867)
- Kingdom of Asturias - Ordoño I (850–866)
  - County of Castile - Rodrigo, Count of Castile (860–873)
- Caliphate of Córdoba - Muhammad I (852–886)
- Kingdom of Pamplona - García Íñiguez (851/852–882)
Wales -
- Kingdom of Gwynedd - Rhodri Mawr (844–878)
- Kingdom of Powys - Rhodri Mawr (855–878)