Petar (, ) is a South Slavic masculine given name, their variant of the Biblical name Petros cognate to Peter.

Derivative forms include Pero, Pejo, Pera, Perica, Petrica, Periša. Feminine equivalent is Petra.

People mononymously known as Petar include:

• Petar of Serbia ( – 917), early Prince of the Serbs

• Petar of Duklja (), 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:

See also

• Sveti Petar (disambiguation)

• Petrov (disambiguation)

• Petrić

• Petričević

References