The article examines the significance of volunteer initiatives in providing social services to the population of Ukraine under extraordinary conditions caused by full-scale military aggression. The relevance and invaluable importance of the volunteer movement as an indispensable resource for effective support and assistance to vulnerable population categories affected by the war are highlighted. Special attention is given to a comprehensive review of the functioning and interaction of volunteer organizations with state institutions and international humanitarian organizations, which facilitates prompt and effective response to the urgent needs of society. The study emphasizes the importance of inclusivity in volunteer initiatives, demonstrating how the participation of persons with disabilities, internally displaced persons, and other socially vulnerable groups in volunteer activities contributes to their social integration and psychological rehabilitation. Examples of effective cross-sectoral cooperation based on principles of mutual trust, responsibility, and common goal, allowing for quick and efficient response to the needs of the affected, are illuminated. Outlined are the prospects for further development of the social sphere based on the integration of efforts of all participants in social provisioning, the use of innovative approaches and practices gained as a result of the war experience. The necessity of developing and implementing new policies aimed at attracting more volunteers and resources to address a complex of social problems is underlined. The importance of the research lies in highlighting the role of volunteering as a strategic resource in supporting the resilience and adaptation of society to the challenges of wartime.