Volunteering in Ukraine is becoming an increasingly popular phenomenon that occupies an important place in the life of society. Many people choose volunteering as a way to help people in difficult life circumstances, as well as to develop their own personality and engage in active civic participation. As a significant social phenomenon, volunteering has its own ideological foundations that define its core values and principles. Volunteering is based on the desire to help people and nature regardless of their status, nationality, religion, or political beliefs. The purpose of the study. The current study examines the ideological foundations of volunteering in Ukraine in wartime and their significance for volunteering, to study the practical experience of volunteers in Ukraine in 2014-2023, and to examine the peculiarities of the legal regulation of volunteering in Ukraine in wartime. Methods. Achieving the goal and objectives of the study was made possible by using a set of interrelated modern general scientific and special methods and approaches. The systematic approach made it possible to study volunteering as a holistic set of elements in the totality of the connections between them. Through the use of the method of systematization, the author provides a review of the legal framework for volunteering, factor analysis is used to determine the factors influencing the relationship between the state and society in the field of volunteering, and system analysis is used to assess the state of relations between the state and society in Ukraine at this stage through its quantitative indicators.Results. According to the study “Volunteer Movement in Ukraine”, prepared by GfK Ukraine on behalf of the UN in Ukraine, Ukrainian citizens pay great attention to the volunteer movement in the development of social processes: 62% recognize the role of volunteers in the changes in the last year; 85% believe that the volunteer movement helps strengthen peace; 81% tend to consider the volunteer movement an essential component of civil society. Regarding the legal regulation of volunteer activities in Ukraine, the Law of Ukraine “On Volunteer Activity” of April 19, 2011, No. 3236-VI was adopted in April 2011. The Law of Ukraine of 15.08.2022 No. 2519-IX On Amendments to the Law of Ukraine “On Volunteer Activity” on Support of Volunteer Activity regulates social relations related to volunteer activity in Ukraine. Discussion. One of the key principles of volunteering in Ukraine is selflessness and the ability to work in extreme conditions. Volunteers often work in difficult and dangerous conditions that require a high level of professionalism and skills. For many volunteers, the Ukrainian revolution of 2013-2014 and the events in eastern Ukraine were turning points that forced them to change their attitude to their own lives and start helping others. Ukrainian volunteers are an example of community and state cooperation that contributes to ensuring security and helping victims. They have shown that volunteering can be an effective tool in the fight against war and its consequences. Many volunteer organizations provided free medical care, took on the responsibility of supplying the military with necessary items and military equipment, organized the evacuation of people from the war zone, and provided psychological support to the military and their families. Conclusions.Volunteering in Ukraine is not a new phenomenon, but the war with Russia has become a catalyst for its development. This is a great example of how crises can encourage people to act together and interact to achieve a common goal. Volunteerism in Ukraine demonstrates the importance of spiritual unity and cooperation in difficult times, and is one of the most striking examples of civil society in action. The ideological principles of volunteering in Ukraine include non-profitability, openness, spirituality, and humanism, transparency and openness, security, and cooperation with government agencies and the military. The volunteer movement in Ukraine, especially in times of war, is an important factor in ensuring security and helping victims. Involvement of different groups of the population in volunteer activities, as well as cooperation with state and international structures, are important to ensure the effectiveness and success of volunteer activities.