Islam is the second-largest faith in Croatia after Christianity. The religion is followed by 1.47% of the country's population according to the 2011 census, compared to 91.06% Christians and 4.57% not religious, atheists, agnostics and sceptics. Islam was first introduced to Croatia by the Ottoman Empire during the Croatian–Ottoman Wars that lasted from 15th to 16th century. During this period some parts of the Croatian Kingdom were occupied which resulted in numerous Croats converting to Islam, some after being taken prisoners of war, some through the devşirme system. Nonetheless, Croats strongly fought against the Turks during these few centuries which resulted in the fact that the westernmost border of the Ottoman Empire in Europe became entrenched on the Croatian soil. In 1519, Croatia was called the Antemurale Christianitatis by Pope Leo X. The Islamic Community of Croatia is the main organization of Muslims in Croatia that is officially recognized by the state. The President of the Islamic Community is Aziz Effendi Hasanović. As of 2011, 62,977 Muslims live in Croatia. Most of them declare themselves as Bosniaks while others declare themselves as: Albanians, Roma, Turks, Macedonians, Montenegrins and other. The first modern mosque in Croatia was built in Gunja in 1969. Today there are 4 mosques and 2 Islamic centers in Croatia.
History
Ottoman times
The Turkish Ottoman Empire conquered part of Croatia from the 15th to the 19th century. Numerous Croats converted to Islam, some after being taken prisoners of war, some through the devşirme system. The westernmost border of Ottoman Empire in Europe became entrenched on Croatian soil. In 1519, Croatia was called the Antemurale Christianitatis by Pope Leo X. The historical names of many officials in the Ottoman Empire reveal their origin : Rüstem Pasha, Piyale Pasha, Memipaša Hrvat, Tahvilpaša Kulenović Hrvat etc. There was some considerable confusion over the terms "Croat" and "Serb" in these times, and "Croat" in some of these cases could mean anyone from the wider South Slavic area. In 1553, Antun Vrančić, Roman cardinal, and Franjo Zay, a diplomat, visited Istanbul as envoys of the Croatian-Hungarian king to discuss a peace treaty with the Ottoman Empire. During the initial ceremonial greetings they had with Rüstem Pasha Hrvat the conversation led in Turkish with an official interpreter was suddenly interrupted. Rustem Pasha Hrvat asked in Croatian if Zay and Vrančić spoke Croatian language. The interpreter was then dismissed and they proceeded in the Croatian language during the entire process of negotiations. In 1585, traveler and writer Marco A. Pigaffetta, in his Itinerario published in London, states: In Constantinople it is customary to speak Croatian, a language which is understood by almost all official Turks, especially military men. Crucially though, the lingua franca at the time among Slavic elites in the Ottoman Empire was still Old Church Slavonic. For Italians traveling through to Istanbul, the language of the Slavic Croats was often the only exposure they had to any of the Slavic languages; indeed, Bulgarian and Macedonian dialects were far more common in Istanbul than Croatian.
In the 1960s, the Bosnians Muslims community advocated for the recognition of the Bosniaks as a nationality in SFR Yugoslavia. The 1974 Yugoslav Constitution allowed for the official recognition of the Muslims as a nationality, therefore allowing more individuals to declare their alignment with a compromise categorization of Muslims by nationality, in this case separated from a religious basis. For example, Džemal Bijedić, a communist federal prime-minister was a declared "Muslim" and an atheist. The spike in the number of self-declared "Muslims" during socialist Yugoslavia times should thus be understood as persons having a family Muslim cultural background, rather than practicing believers in Islam. Based on the figures recorded during the 1931 to 1961 census, it may also be concluded that a certain number of Muslim believers declared themselves as Croats or Yugoslavs. After the dissolution of Yugoslavia, an additional increase can be attributed to the influx of Bosnian Muslims that took place during and after the 1992-1996 Bosnian conflict. The 2001 Croatian census identified a total of 56,777 adherents of Islam, or 1.3% of the total population of Croatia. The following ethnic groups were presumed to be significantly Muslim:
20,755 Bosniaks
19,677 continued to use the Yugoslav term Muslims as a nationality
Turks: 300
A remainder of 16,345 individuals who declared themselves some other nationality, possibly Croats, Albanians and Roma.
Statistics
The published data from the 2011 Croatian census included a crosstab of ethnicity and religion which showed that a total of 62,977 Muslims was divided between the following ethnic groups:
Croatia's capital Zagreb has one of the biggest mosques in Europe since 1987. During the existence of the Ottoman Empire it had none because Zagreb, as well as most parts of Croatia, was not occupied by the Ottomans during the Hundred Years' Croatian–Ottoman War. The Bosniak imam Ševko Omerbašić, was the long-time leader of the Muslim community of Croatia and the Mufti of Zagreb. A new mosque in Rijeka was opened in May 2013. The Muslim community is also planning to build a mosque in Osijek and Sisak. A mosque in Karlovac is also being considered.