This thesis analyzes the role of associations in the local community, focusing on education, humanitarian initiatives, ecology, and other areas of social activity. The goal is to examine how associations contribute to social capital, community cohesion, and quality of life, while identifying key factors influencing their success and sustainability. The research combines theoretical analysis and empirical data through interviews with members and leaders of various associations. The empirical section evaluates the real impact of these associations on specific segments of the local community, assessing their challenges and achievements. The IAESTE association facilitates international student mobility, while CroMSIC promotes health education. PLANTaža raises environmental awareness and fosters cultural enrichment, and both PRONI Center and DKolektiv provide educational programs for youth. The Pobjede association cares for abandoned and abused dogs, offering humanitarian aid. The interviews emphasize the importance of these associations in improving quality of life and promoting social inclusion. The results indicate that associations significantly impact social inclusion, support for vulnerable groups, environmental conservation, and the encouragement of active citizenship. It is concluded that the success of associations depends on support networks, financial stability, cooperation with local authorities, and active involvement of community members. A sustainable development strategy for associations is crucial for the long-term progress of the community.