There are about 260 million Orthodox Christians, making up 12% of the global Christian population.
Nearly four-in-ten Orthodox Christians worldwide (39%) reside in Russia, the country with the
largest number of Orthodox. Ethiopia has the second-largest number of Orthodox Christians and more than three times as many Orthodox as Greece. Although Turkey is the seat of the ecumenical patriarch of Constantinople, one of the highest archbishops in Orthodox Christianity (see Defining Christian Traditions for details), its Orthodox population is relatively small (about 180,000).
Nearly nine-in-ten (87%) of the world’s Orthodox Christians can be found in the 10 countries with the largest Orthodox populations. Most of the countries with large numbers of Orthodox Christians have an Orthodox majority – though the Orthodox make up less than half the total population in Ethiopia and only about 5% of the population in Egypt. (See spotlights on Ethiopia and Egypt.) Orthodox Christians make up a majority of the total population in 14 countries.
The Orthodox Christian population is heavily concentrated in Europe, which, for the purposes of this report, includes all of Russia. Europe is home to 77% of the global Orthodox population. Sub-Saharan Africa has about 15%, and the Asia-Pacific region (including Turkey) has roughly 5%. Small shares of Orthodox Christians also are found in the Middle East-North Africa (about 2%) and the Americas (1%).