List of state leaders in 904

903 state leaders - Events of 904 - 905 state leaders - State leaders by year----

Africa

*Algeria - Yusuf Abu Hatim, Rustamid Emir (901-906)
*Egypt
**Harun, Tulunid Emir (896-904)
**Shaiban, Tulunid Emir (904-905)
*Ifriqiya - Abu Mudar Ziyadat Allah III, Aghlabid Emir (903-909)
*Morocco
**Yahya III, Idrisid Emir (880-904)
**Yahya IV, Idrisid Emir (904-922)

Asia

*Bohai/Balhae - Da Weixie/Dae Wigye, King of Bohai/Balhae (895-906)
*"'Byzantine Empire - Leo VI the Wise, Byzantine Emperor (886 - 912)
*China (Tang Dynasty) -
*#Zhaozong, Emperor of Tang China (888-904)
*#Emperor Ai, Emperor of Tang China (904-907)
*Japan - Emperor Daigo, emperor of Japan (897-930)
*Korea (Later Three Kingdoms Period)
**Hubaekje - Gyeon Hwon, King of Hubaekje (900-935)
**Majin - Gung Ye, King of Majin (901-911); King of Taebong (911-918)
**Silla - Hyogong, King of Silla (897-912)
*Khmer Empire - Yasovarman, King (899-910)

Europe

*Asturias - Alfonso III the Great, King of Asturias (866-910)
*Bohemia - Spytihněv I, Duke of Bohemia (c.894-915)
*Brittany - Alan I, Duke of Brittany (877-907)
*Bulgaria - Simeon I the Great, Knyaz of Bulgaria (893-927)
*Byzantine Empire - Leo VI the Wise, Byzantine Emperor (886 - 912)
*Cordoba - Abdallah ibn Muhammad , Emir of Cordoba (888-912)
*England
**Mercia - Aethelred, King of Mercia (879-911)
**Wessex - Edward the Elder, King of Wessex (899-924)
*East Francia - Louis the Child, King of East Francia (899-911)
**Bavaria - Liutpold, Duke of Bavaria (889-907)
**Saxony - Otto I the Illustrious, Duke of Saxony (?-912)
*Great Moravia - Mojmír II, last king of the Great Moravian Empire (894-?906).
*Holy Roman Empire - Louis III the Blind, Holy Roman Emperor (901-905)
*Kievan Rus - Oleg of Novgorod, Prince of Kiev (879-912)
*Leon - Alfonso III, King of Leon (866-910)
*Magyars - Árpád, Fejedelem (c.890-907)
*Norway - Harald I Fairhair, King of Norway (872-933)
*Papal States
**Christopher, Antipope (903-904)
**Sergius III, Pope (904-911)
*Scotland - Constantine II, King of Scotland (900-943)
*Venice - Pietro Tribuno, Doge of Venice (888-912)
*Wales -
**Anarawd ap Rhodri, King of Gwynedd (878-916)
*Western Francia - Charles the Simple, King of Western Francia (898-922)
**Anjou - Fulk I, Count of Anjou (898-941)
**Aquitaine - William I, Duke of Aquitaine (893-918)
**Barcelona - Wilfred II Borrel, Count of Barcelona (897-911)
**Burgundy - Richard, Duke of Burgundy (887-921)
**Upper Burgundy - Rudolph I, Duke of Upper Burgundy (888-912)

Middle East

*Abbasid Caliphate - Al-Muktafi, Abbasid Caliph (902-908)
*Byzantine Empire, Leo VI the Wise, Byzantine Emperor (886-912)
*Persia
**Saffarids - Tahir I (901-908)
**Samanids - Isma'il (892-907)