In modern society the topic of immigrants is becoming more important, especially with their number being increased daily. There are also many problems and risks involved, which includes their inclusion in the society. This paper seeks to demonstrate the role that NGOs have in work with immigrants, the services and opportunities they offer, and their collaboraion with the government sector. In doing so, we will mention legal frameworks and other relevant documents that are significally affecting their work. It also seeks to explain the international impact on the work of the organizations, as well as its integration programs and psychosocial support, legal assistance and activist engagement. The organizations that we focused on onclude Center for Peace Studies, Are You Syrious?,Croatian Red Cross, Croatian Law Center, Jesuit Refugee Service, Stress and Trauma Rehabilitation Center, Croatian Baptist Aid, Psychological Assistance Society and Medecins du Monde. The territorial role of the Republic of Croatia has proved to be of great importance, furthermore despite its characteristic of a transit country, a large number of immigrants still remain. Republic of Croatia is trying to legally follow the regulations of EU, but their implementation has been slow and inadequate.The importance and role of social workers in this field is also highlighted.