Petar (Bulgarian: Петър, Serbian Cyrillic: Петар) is a South Slavic masculine given name, their variant of the Biblical name Petros[1] cognate to Peter.
Derivative forms include Pero, Pejo, Pera, Perica, Petrica, Periša. Feminine equivalent is Petra.
People mononymously known as Petar include:
- Petar I of Bulgaria (r. 927-969), Emperor (Tsar) of Bulgaria
- Petar I Petrović-Njegoš (1747–1830), Montenegrin ruler, metropolitan and saint
- Peter I of Serbia (1844–1921), Serbian king
- Petar II of Bulgaria, Bulgarian tsar (ruled 1186–1197)
- Petar II Petrović-Njegoš, the Montenegrin ruler (1813–1851)
- Peter II of Yugoslavia, the Yugoslavian king (ruled 1934–1945)
- Petar of Serbia (c. 870 – 917), early Prince of the Serbs
- Petar of Duklja (fl. 10th century), early archont in Dioclea
- Petar Krešimir (died 1074/1075), King of Croatia and Dalmatia
- Petar Delyan (r. 1040-1041), Bulgarian rebel, declared Emperor of Bulgaria
Notable people with the name are numerous: