The current paper aims to identify the antecedents of social entrepreneurial intention formation. Applying the theory of planned behavior on an international sample of 159 entrepreneurial volunteers in a corporate framework, we find positive relationships between empathy, perceived social norms, self-efficacy, perceived collective efficacy, and social entrepreneurial intentions with mediation by perceived desirability and perceived feasibility. Overall, we contribute to the upcoming domain of social entrepreneurship research by investigating the individual and environmental antecedents of social entrepreneurial action in a corporate setting.