Olga is an Eastern Slavic female given name, derived from Old Norse name Helga. It is used in Russia (Ольга), Ukraine (Ольга, transliterated Ol'ha), Belarus (Вольга, transliterated Vol'ha), Bulgaria (Олга transliterated Ólga), Poland, the Faroe Islands, the Czech Republic, Greece (Όλγα, Ólgha), Finland, Hungary, Romania, Serbia (Olga), Iceland, and Latin America. The male equivalent is Oleg (Олeг).
Name days (St. Olga of Kiev): Bulgaria, Poland, Czech Republic, Greece and France – July 11, Slovakia – July 23, Russia – July 24, Hungary – July 27.