List of state leaders in 863

862 state leaders - Events of 863 - 864 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 (Heian Period) - 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, Khan of the Bulgars (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 - Trpimir I, Duke of Littoral Croatia (845–864)
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 -
  1. Osberht, King of Northumbria (849–862/863)
  2. Ælla, King of Northumbria (862/863–867)
- Wessex - Æthelbert, King of Wessex (860–865)
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 -
  1. Turpion (839–863)
  2. 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 -
  - Pepin II of Aquitaine, King of Aquitaine (854–864)
  - Charles the Child, King of Aquitaine (855–866)
- County of Auxerre - Conrad I (859–864)
- Barcelona - Humfrid, Count of Barcelona (858–865)
- Duchy of Brittany - Salomon (857–874)
- County of Flanders - Baldwin I (862–879)
- Gascony - Sans II Sancion of Gascony, Duke of Gascony (836–864)
- County of Maine - Rorgon II (853–865)
- March of Neustria -
  - Adalard the Seneschal (861–865)
  - Udo (861–865)
  - Berengar I (861–865)
- Poitiers - Ranulf I, Count of Poitiers (854–866)
- County of Toulouse -
  1. Raymond I, Count of Toulouse (852–863)
  2. Humfrid, Count of Toulouse (863–865)
- Tours - Robert the Strong, Count of Tours (860–866)
- Troyes - Rudolph I, Count of Troyes (858–866)
- Urgell - Solomon, Count of Urgell (848–869)
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 -
  1. Muirecán mac Diarmata, King of Leinster (862–863)
  2. Dúnlaing mac Muiredaig, King of Leinster (863–869)
- Mide - Lorcán mac Cathail, King of Mide (862–864)
- 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 -
  1. Pandenulf, Count of Capua (862–863)
  2. Landulf II, Count of Capua (863–879)
- March of Friuli -
  1. Eberhard (846–863)
  2. Unruoch III (863–874)
- Duchy of Gaeta - Constantine, Hypatus of Gaeta (839–866)
- Duchy of Naples - Sergius I, Duke of Naples (840–864)
- 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 - Pietro Tradonico, Doge of Venice (836–864)
Lotharingia - Lothair II, King of Lotharingia (855–869)
Great Moravia - Rastislav, Prince of Great Moravia (846–870)
Provence - Charles, King of Provence (855–863)
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)