Religion in Austria

Religion in Austria is predominantly Christianity, adhered to by 68.2% of the country's population according to the 2021 national survey^[a] conducted by Statistics Austria.^[1] Among Christians, 80.9% were Catholics, 7.2% were Orthodox Christians (mostly belonging to the Eastern Orthodox Church), 5.6% were Protestants, while the remaining 6.2% were other Christians, belonging to other denominations of the religion or not affiliated to any denomination.^[1] In the same census, 8.3% of the Austrians declared that their religion was Islam, 1.2% declared to believe in other non-Christian religions (including Buddhism, Hindusim, Judaism and others), and 22.4% declared they did not belong to any religion, denomination or religious community.^[1]

According to church membership data, in 2021 53.9% of the population were Roman Catholics^[2] and 3.0% adhered to Protestant churches.^[3]

Austria was historically a strongly Catholic country, having been the centre of the Habsburg monarchy (1273–1918) which championed Roman Catholicism.^[4] Although in the 16th century many Austrians converted to Protestantism, Lutheranism in particular, as the Protestant Reformation (begun in 1517) was spreading across Europe, the Habsburgs enacted measures of Counter-Reformation as early as 1527 and harshly repressed Austrian Protestantism, albeit a minority of Austrians remained Protestant.^[4] A few decades after the fall of the Habsburg monarchy at the end of the World War I, and the transformation of Austria into a federal republic, at least since the 1970s there has been a decline of Christianity (with the exception of Orthodox churches) and a proliferation of other religions, a process which has been particularly pronounced in the capital state of Vienna.^[5]

Between the censuses of 1971 and 2021, Christianity declined from 93.8% to 68.2% of the Austrian population (Catholicism from 87.4% to 55.2%, and Protestantism from 6% to 3.8%, while Orthodox Christianity grew from 2.2% to 4.9% between 2001 and 2021).^[1] During the same timespan, Islam grew from being the religion of 0.2% to 8.3% of the Austrian population, and the proportion of people neither affiliating with nor belonging to any religion grew from 4.3% to 22.4%.^[1]

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