List of state leaders in 867

866 state leaders - Events of 867 - 868 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 -
1. Michael III (842–867)
2. Basil I (867–886)
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 - Bagsecg (c. 866–c. 871)
England (Heptarchy) -
- Kingdom of East Anglia - Edmund the Martyr (854–869)
- Mercia - Burgred, King of Mercia (852–874)
- Northumbria² -
  1. Ælla, King of Northumbria (862/863–867)
  2. Osberht, King of Northumbria (867)
  3. Ecgberht I, King of Northumbria (867–872)
- Wessex - Æthelred, King of Wessex (865–871)
East Francia - Louis the German, King of East Francia (843–876)
- Duchy of Saxony - Brun, Duke of Saxony (866–880)
- Thuringia - Thakulf, Duke of Thuringia (849–873)
West Francia - Charles the Bald, King of West Francia (843–877)
- County of Angoulême - Wulgrin I (866–886)
- Kingdom of Aquitaine - Louis the Stammerer, King of Aquitaine (866–877)
- County of Auxerre - Hugh the Abbot (866–870)
- Barcelona - Bernard II, Count of Barcelona (865–878)
- Duchy of Brittany - Salomon, Duke of Brittany (857–874)
- County of Flanders - Baldwin I (862–879)
- County of Maine - Gosfrid (865–878)
- March of Neustria - Gosfrid of Maine (865–878)
- Poitiers - Bernard of Gothia, Count of Poitiers (866–877)
- County of Toulouse - Bernard II (865–877)
- Tours - Hugh the Abbot, Count of Tours (866–886)
- Troyes - Odo I, Count of Troyes (866–871)
- 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 - Docibilis I, Hypatus of Gaeta (866–906)
- Duchy of Naples - Gregory III (864–870)
- Papal States -
  1. Pope Nicholas I (858–867)
  2. Pope Adrian II (867–872)
- 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)
- Duchy of Alsace - Hugh (867–885)
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 -
  1. Galindo Aznárez I (844–867)
  2. Aznar Galíndez II (867–893)
- Kingdom of Asturias - Alfonso III (866–910)
  - County of Castile - Rodrigo (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)

Notes

Though East Anglia is traditionally perceived to have been in the heptarchy it was a largely independent kingdom until its conquest by the Danes in 870. All other members of the heptarchy, apart from Mercia and Northumbria, had been conquered by Wessex and by this time had no form or king. Mercia was unique in its maintenance of an independent dynasty during the heptarchy.
Northumbria was conquered in 867 by Halfdan, Ivar the Boneless and their Danish Great Heathen Army. They imposed a puppet king on the state. Immediately prior to conquest a dynastic dispute was occurring which weakened the kingdom.