The purpose of this study is to examine the impact of social entrepreneurship in public institutions on organizational performance through ESG management in a situation where social entrepreneurship is receiving attention as an innovative solution as more and more social problems are emerging in modern society. That is, this study aimed to examine whether social entrepreneurship, which is a public institution's disposition and organizational culture including proactiveness, innovativeness, risk-taking, and social-oriented, affects the sub-elements of ESG management, namely environment, society, and governance management, and improves organizational performance. A survey method was used to collect data to verify the research hypothesis and model. The survey was conducted for 30 days from March 5 to April 5, 2024, targeting members of public institutions in Gyeongsangbuk-do, and a total of 285 responses were received. After excluding 13 incomplete responses, 262 questionnaires were used in the final analysis. Data were analyzed using the SPSS version 26.0 and AMOS version 26.0 statistical programs. The analysis results showed that the social entrepreneurship spirit of public institutions, including proactiveness, innovativeness, risk-taking, and social-oriented, affects the sub-elements of ESG management, namely environment, society, and governance management, thereby improving organizational performance. The results of this study suggest that the social entrepreneurship spirit of public institutions is an important factor in improving management strategy and performance.