Multiculturalism is a term that today frequently appears in political, social and cultural dialogue, and in the broadest sense of the word implies the coexistence of different cultural groups within a community. The article talks about the history of the development of multicultural services to the emergence of the Internet in developed countries since the 60s of the 20th century as a consequence of the great migration of the population, when the library profession has accepted the challenge and responsibility to meet the general cultural and reading needs of minority ethnic and linguistic communities. In Croatia, the multicultural services developed in the 90s, when libraries started applying the concept of library services for members of ethnic and national minorities. Croatia is a multicultural country with 22 ethnic minorities with about 9.58% stake in the Croatian society. In the first part of the article, attention is focused on defining the concept of multiculturalism, interculturalism and cultural pluralism, on the review of the development of multicultural services in libraries in the most developed countries of the world such as the United States, Great Britain, Canada, Germany, Sweden and Australia. The second section discusses the types of multicultural services offered in the Central Libraries for National Minorities in Croatia and the problems in connection with the supply of library materials and services. However, as in Croatia there are not only national minorities, but many migrants from different countries who come to Croatia as a transit country or as asylum seekers, the question arises as to whether there are any services for these people in the libraries and some new concepts of providing services for immigrants, immigrant minorities, asylum seekers and all those who came to Croatia from different, either political or other reasons. Many libraries in Croatia have no information on how many such people live in the territory of the Republic of Croatia, but to strengthen their role in the multicultural environment as a meeting point, interaction and intercultural cooperation, they have to be more actively involved in the lives of all people in the area they serve because in that way it will cross the boundaries of local culture and become part of the multicultural world. In the research part of the paper, with the method of semi-structured interviews, the approaches to multiculturalism in the Central Libraries of National Minorities in Croatia, the level of services and the degree of organization, specialties and new concepts of providing services to various marginalized groups such as immigrant minorities, asylum seekers, and others are established. By the same method, several members of different national minorities, were examined in order to gain insight into how familiar are they with the Central Libraries for National Minorities and what they think about their services.