This thesis investigates how stakeholders contribute to sport-based social entrepreneurship in Sweden and Thailand, two countries with distinct institutional, cultural, and policy environments. Grounded in Stakeholder Theory, Institutional Theory, and the Quadruple Helix Framework, the study explores the dynamic interplay between social entrepreneurs and their surrounding ecosystems, emphasizing how contextual factors shape stakeholder roles, engagement patterns, and legitimacy.The central research question guiding this study is: How do stakeholders contribute to sport-based social entrepreneurship across diverse cultural and institutional settings? To address this, a qualitative comparative case study was conducted, drawing on semi-structured interviews with sport-based social entrepreneurs and stakeholder actors in both countries. Thematic analysis was used to identify recurring patterns and differences, with particular attention to institutional logic, stakeholder dynamics, and mechanisms of collaboration.The findings reveal that while both contexts value cross-sectoral collaboration, the nature of stakeholder engagement is shaped by different institutional pressures and normative frameworks. In Sweden, stakeholder participation is influenced by welfare-oriented policies but constrained by performance-based funding models and bureaucratic expectations. In Thailand, state-centric control and hierarchical governance structures limit grassroots ownership and inclusive stakeholder involvement, despite growing institutional support for social entrepreneurship. Across both cases, informal networks, values-driven missions, and adaptive collaboration emerged as critical for sustaining social value creation.This thesis contributes to the growing literature on sport-based social entrepreneurship by offering a context-sensitive and theoretically grounded analysis of stakeholder engagement. It extends existing frameworks by highlighting the importance of institutional fit, local trust networks, and cognitive-normative alignment in shaping the success and sustainability of social ventures in sports. By providing empirical insights from underexplored national settings, this study opens new directions for research and practice in inclusive, community-embedded social entrepreneurship initiatives.