List of state leaders in 966

965 state leaders – Events of 966 – 967 state leaders – State leaders by year

Africa

Fatimid Caliphate – Maʻād al-Muʻizz li Dīn Allāh, Caliph (953–975)

Asia

Byzantine Empire – Nikephoros II Phokas (Νικηφόρος Β' Φωκάς) (963–969)
China –
- Northern Song Dynasty – Taizu, Emperor of Song China (960–976)
- Dingnan – Li Yixing, Dingnan Jiedushi (935–967)
- Northern Han – Liu Chengjun, Emperor of Northern Han (954–970)
- Pinghai – Chen Hongjin, Pinghai Jiedushi (963–978)
- Southern Han – Liu Chang, Emperor of Southern Han (958–971)
- Southern Tang – Li Houzhu, Ruler of Southern Tang (961–975)
- Wuyue – Qian Chu, King of Wuyue (947–978)
Japan – Emperor Murakami emperor of Japan (946–967)
Korea (Goryeo Dynasty) – Gwangjong, King of Goryeo (949–975)
Liao (Khitan Empire) – Muzong, Emperor of Liao (951–969)

Europe

Bulgaria - Peter I, Tsar of Bulgaria (927–969)
Kingdom of Burgundy - Conrad the Peaceful (937–993)
- County of Arles - Boso II, Count of Arles (949–968)
Byzantine Empire - Nikephoros III (963–969)
Caucasus
- Kingdom of Armenia - Ashot III (953–977)
- Kingdom of Iberia - Bagrat II (958–994)
- Principality of Kakheti - Kvirike II, Prince of Kakheti (929–976)
- Klarjeti - Sumbat II, Prince of Klarjeti (943–988)
Kingdom of Croatia - Mihajlo Krešimir II (949–969)
Kingdom of Denmark - Harald I (958–985/986)
Kingdom of England – Edgar (959–975)
West Francia - Lothair, King of West Francia (954–986)
- County of Angoulême - Ranulf (962–975)
- County of Anjou - Geoffrey I (958–987)
- Duchy of Aquitaine - William IV (963–995)
- County of Blois - Theobald I (960–975)
- Duchy of Brittany - Hoel I (c. 960–981)
- Duchy of Burgundy - Eudes-Henry, Duke of Burgundy (965–1002)
- County of Flanders - Arnulf II (965–987)
- County of Maine - Hugh II (950–992)
- March of Neustria - Hugh Capet (956–987)
- Duchy of Normandy - Richard I, Duke of Normandy (942–996)
- County of Paris - Hugh Capet (956–996)
- County of Toulouse - Raymond IV (944–972)
- County of Vermandois - Adalbert I (943–987)
Gascony - William II, Duke of Gascony (c. 961–996)
Holy Roman Empire - Otto I the Great, Holy Roman Emperor (962–973)
- Bavaria - Henry II, Duke of Bavaria (955–976)
- Duchy of Bohemia - Boleslaus I (935–972)
- Archbishopric of Cologne - Volkmar (965–969)
- Lotharingia -
  - County of Bar - Frederick I (959–978)
  - County of Frisia - Dirk II (c. 939–988)
  - County of Luxembourg - Siegfried (963–998)
  - Lower Lorraine - Richar, Duke of Lower Lorraine (964–973)
  - Upper Lorraine - Frederick I, Duke of Upper Lorraine (959–978)
  - County of Mons - Richar (964–973)
- Duchy of Saxony - Otto I the Great (936–973)
  - Billung March - Hermann Billung, Margrave of Saxony (953–973)
  - Eastern March - Odo I, Margrave of the Eastern March (965–993)
  - Northern March - Dietrich of Haldensleben (965–983)
  - March of Meissen - Wigbert, Margrave of Meissen (965–970)
  - March of Merseburg - Günther (965–976)
  - March of Zeitz - Wigger I (965–981)
- Duchy of Swabia - Burchard III, Duke of Swabia (954–973)
Hungarian tribal federation - Taksony, Grand Prince of the Hungarians (c. 955– c. 972)
Ireland - Domnall ua Néill, High King of Ireland (956–980)
- Ailech - Domnall ua Néill, King of Ailech (943–980)
- Connacht - Fergal Ua Ruairc, King of Connacht (956–967)
- Leinster -
  1. Cellach mac Faelan, King of Leinster (958–966)
  2. Murchad mac Finn, King of Leinster (966–972)
- Kingdom of Mide - Donnchad Finn mac Aeda (960–974)
- Munster - Máel Muad mac Brain, King of Munster (963–970)
Italy - Otto I, King of Italy and Holy Roman Emperor (963–973)
- Duchy of Amalfi -
  1. Sergius I (958–966)
  2. Manso I (966–1004)
- Principality of Benevento - Pandulf I (961–981)
- Principality of Capua - Pandulf I (961–981)
- Duchy of Gaeta - Gregory (963–978)
- March of Ivrea - Conrad (965–989)
- March of Montferrat - Aleramo, Marquess of Montferrat (958–967)
- Duchy of Naples - John III (928–968)
- Papal States - Pope John XIII (965–972)
- Principality of Salerno - Gisulf I (946–977)
- Emirate of Sicily - Ahmad ibn Ḥasan (954–969)
- Duchy of Spoleto - Thrasimund III (959–967)
- March of Tuscany - Hugh (961–1001)
- Republic of Venice - Pietro IV Candiano, Doge of Venice (959–976)
Kievan Rus' - Sviatoslav I, Prince of Kiev (945–972)
- Principality of Polotsk - Rogvolod (c. 945–c. 978)
Norway - Harald II Greycloak, King of Norway (961–970)
Poland - Mieszko I, Duke of the Polans (c. 960–992)
Kingdom of Alba (Scotland) - Dub (962–967)
Spain -
- County of Barcelona -
  - Borrell II, Count of Barcelona (947–993)
  - Miro I, Count of Barcelona (947–966)
- County of Castile - Fernán González (931–970)
- Caliphate of Córdoba - Al-Hakam II (961–976)
- Kingdom of León -
  1. Sancho I (960–966)
  2. Ramiro III (966–984)
  - County of Portugal - Gonçalo I Mendes (c. 950–997)
- Kingdom of Pamplona - García Sánchez I (931–970)
Wales -
- Deheubarth - Owain ap Hywel, Prince of Deheubarth (950–987)
- Kingdom of Gwynedd -
  - Iago ab Idwal, co-King of Gwynedd (950–979)
  - Ieuaf ab Idwal, co-King of Gwynedd (950–969)
- Kingdom of Powys - Owain ap Hywel (950–987)