The public sector has traditionally provided social finance. As the importance of private social finance investors and companies grows, so too do calls for their regulation to avoid potential conflicts of interest between financial and social returns. Based on existing efforts and experiences in the European Union, this chapter provides an overview of regulatory approaches to social finance, including minimum standards and the disclosure of social risk and impact data. When regulating social finance, the chapter maintains that authorities must consider proportionality, sufficient scope, a greater focus on qualitative impact measures, and a need to ensure data quality and availability before mandating disclosures.