This study examined the proliferation of NGOs and social service delivery in the Adamawa North Sectorial District. The data for the study was obtained using a structured questionnaire administered to 400 purposively selected beneficiaries of NGO social services and NGO officials. The estimation techniques employed are descriptive statistics like frequencies and percentages and inferential statistics like Chi-square. The result indicates that the proliferation of NGOs promotes social service delivery in Adamawa North Senatorial District. In addition, the proliferation of NGOs has a significant effect on the social well-being of people in Adamawa North Senatorial District. Furthermore, NGOs faced challenges in their bid to deliver social services in Adamawa North Senatorial District. Thus, the study recommends that the government and individuals should provide an enabling environment for NGOs to consolidate their mandate of providing social services and enter a partnership agreement with NGOs so that they can aid in facilitating government policies and programmes in reaching remote areas in Adamawa State. In addition, there is a need to improve the funding profile of both local and international NGOs and ensure minimal interference from political elites, citizens participation should be encouraged, and the security architecture of the district be beefed up.