List of state leaders in 899
898 state leaders – Events of 899 – 900 state leaders – State leaders by year
Africa
Asia
Europe
- Bulgaria - Simeon I, Knyaz of Bulgaria (893–927)
- Upper Burgundy - Rudolph I, King of Upper Burgundy (888–912)
- Byzantine Empire - Leo VI (886–912)
- Caucasus
- Littoral Croatia - Muncimir, Duke of Littoral Croatia (892–910)
- England (Heptarchy) -
- East Francia -
- Arnulf of Carinthia, King of East Francia (887–899) and Holy Roman Emperor (896–899)
- Louis the Child, King of East Francia (899–911)
- West Francia - Charles the Simple, King of West Francia (898–922)
- Gascony - Gassia II, Duke of Gascony (893–c. 930)
- Hungarian tribal federation - Árpád, Grand Prince of the Magyars (c. 895–c. 907)
- Ireland - Flann Sinna, High King of Ireland (879–916)
- Italy - disputed between:
- Kievan Rus' - Oleg of Novgorod, Prince of Kiev (882–912)
- Great Moravia - Mojmír II, King of Great Moravia (894–906)
- Norway - Harald I Fairhair, King of Norway (872–930)
- Novgorod - Oleg, Prince of Novgorod (879–912)
- Kingdom of Provence - Louis the Blind (887–928)
- Kingdom of Alba (Scotland) - Donald II (889–900)
- Serbia - Petar Gojniković, Knez of Serbia (892–917)
- Spain -
- Wales -
Middle East