List of state leaders in 455

Africa

*Kingdom of the Vandals and Alans - Geiseric, King of the Vandals and Alans (428-477)

America

*Palenque - "Casper", Ajaw of Palenque (435-487)

Asia

*China (Southern and Northern Dynasties) -
** Liu Song Dynasty - Emperor Xiaowu, Emperor of Liu Song (454-464)
** Northern Wei Dynasty - Emperor Wencheng, Emperor of Northern Wei (452-465)
*Gupta Empire
**Kumara Gupta I, Gupta Emperor (415-455)
**Skanda Gupta, Gupta Emperor (455-467)
*Japan (Kofun Era) - Emperor Ankō, Emperor of Japan (c. 453-c. 456)
*Korea (Three Kingdoms) -
**Baekje - Gaero, King of Baekje (454-475)
**Goguryeo - Jangsu, King of Goguryeo (413-490)
**Silla - Nulji, King of Silla (417-458)
*Pallava - Simha Varman II, King of Pallava (438-460)

Europe

*Burgundy
** Gundioc, King of Burgundy (436-473)
** opposed by Chilperic I (443-c.480)
*Byzantine Empire - St. Marcian, Byzantine Emperor (450-457)
*Galicia (Gallaecia) - Rechiar, Suebi King of Galicia (448–456)
*Ireland - Lóegaire mac Néill, High King of Ireland (c. 428-c. 458)
*Kent
**Hengest, King of Kent (c. 455-488)
**Horsa, King of Kent (c. 455-488)
*Salian Franks - Merowig, King of Salian Franks (447-457)
*Visigoths - Theodoric II, King of the Visigoths (453-466)
*Western Roman Empire
**Valentinian III, Western Roman Emperor (425-455)
**Petronius Maximus, Western Roman Emperor (455)
**Avitus, Western Roman Emperor (455-456)

Middle East

*Sassanid Empire - Yazdegerd II, Sassanid King (438-457)