Nowadays about 5 million Turkish citizens live in foreign countries. 4 million of them live in Europe, 300 thousand live in North America, 200 thousand live in Middle East and 150 thousand live in Australia. Turkish language is being spoken by 200 million people over the world as native language. In some countries Turkish language is a state language, in some countries it’s an official language and in some countries it’s a minority or immigrant language. Turkish language is an immigrant language in European Union, Australia, America and Africa. Immigrant languages are languages which are spoken by immigrant communities, who migrate from their homeland to another country for various reasons and speak a different language from majority people language or the official language of political geography where they live. After World War II, Belgium started to develop its industrial power which caused shortage of labor. With the signing of the treaty between Belgium and Turkey by 16 July 1964, Belgium has become a country where Turkish language is spoken as an immigrant language. While the number of Turkish laborer who went to Belgium between 1961-1974 was 15.864, the number of Turkish people living in Belgium approached to 250 thousand in 2017. After accepting that Turkish citizens living in Belgium are permanent, Belgium government started to implement integration/assimilation policies. Since Belgium government believes that Turkish language is the most important obstacle of integration/assimilation of Turkish people, they focused on Turkish language. The importance of language is because of language is decisive of thought, and society is decisive of language. Language is the basic element of continuity of society and transfer of the culture to the next generation. Language means nation. However, the Turkish identity in Belgium is in risk nowadays. Participation in Turkish lessons is decreasing every next year and new generations that are struggling to speak Turkish increases.