It is indicated that in the modern world, where social and environmental problems are becoming increasingly acute, social entrepreneurship appears as an innovative and effective tool for solving them. This phenomenon is at the intersection of business and charity, combining an entrepreneurial approach with a social mission. This article explores the phenomenon of social entrepreneurship as an innovative tool for addressing social and environmental challenges in the modern world. It examines the relevance of developing social entrepreneurship in the context of the UN’s global sustainable development goals and in conditions of limited state resources to meet growing social needs. The author analyzes the historical roots of social entrepreneurship, tracing its evolution from the 17th century to the present day. Special attention is given to the «Triple Bottom Line» concept (profit, people, planet), which underlies social entrepreneurship, and the ideas of Nobel laureate M. Yunus regarding «social business». The article discusses the key characteristics of social entrepreneurship that distinguish it from traditional business, and the principles of social enterprise operation. The author identifies three main models of social entrepreneurship: inclusive, social reinvestment, and innovative social model. Particular attention is paid to the legal aspect of social entrepreneurship in Ukraine, specifically the absence of a special organizational and legal form for such activities and the opportunities provided by current legislation. The author emphasizes the role of social entrepreneurship in the development of the economy and civil society, particularly in job creation, overcoming social isolation, and promoting civic participation. The categories of population for whom social entrepreneurship is especially relevant are considered. The conclusions highlight the potential of social entrepreneurship as a tool for achieving sustainable development and building a more inclusive society, as well as the need for further research in this field, especially in the context of post-COVID reality and the state of war in Ukraine.