Georgi Eldarov was born in the village of Topuzlar (now Zornitsa, Burgas district) in 1926 into the family of the Archbishop of Tsarigrad (Istanbul), Mihail Mirov, the last head of the Bulgarian Uniate Church in Macedonia and Edirne Thrace. He grew up in a Catholic village near Plovdiv. Bulgarian Uniates (Eastern Catholics) and Catholics were particularly suppressed by the communist regime. In 1947 Georgi Eldarov graduated in theology at the Pontifical Academy of Theology in the Vatican. He was a lecturer at several Italian and European universities as well as in the United States. Georgi Eldarov was in charge of the Vatican Radio for more than 20 years (1966-1991). From 1974 onwards, Eldarov was the publisher of the émigré magazine Faith and Enlightenment.

In 1981, he created the Abagar Bulgarian Catholic Cultural Center in Rome, named after the first printed book in Bulgarian, published by the Catholic bishop Philip Stanislavov in Rome in 1651. It housed rare Bulgarian bibliographic publications and the personal collections of Bulgarians living outside Bulgaria closely associated with its history and culture. Eldarov was the publisher of the Catholic newspaper Abagar. He, thus, played an important role in the cultural life of the Bulgarian diaspora and was in contact with political émigrés from Bulgaria, such as Hristo Ognyanov.

Eldarov visited Bulgaria only once during the communist era, in November 1976 with diplomatic immunity as part of a Vatican delegation led by Agostino Casaroli. Eldarov was the first chargé d'affaires of the Vatican in Sofia in 1991, right after the restoration of the diplomatic relations of Bulgaria with the Holy See. After 1993 Professor Eldarov cooperated with the State Agency for Bulgarians Abroad.

The literary archive of the Abagar Bulgarian Catholic Cultural Center was moved from Rome to Bulgaria in 1997. The Abagar Foundation, established at that time, took care of the archive. A year after the death of Prof. Eldarov in 2011 a woman in Sofia was arrested for trading illegally with valuables from the archive; the fate of the archive material is, therefore, unknown.

See also the Bulgarian Wikipedia entry on Eldarov.