Using corporate social responsibility (CSR) ratings for 23,000 companies from 114 countries, we find that a firm's CSR rating and its country's legal origin are strongly correlated. Legal origin is a stronger explanation than "doing good by doing well" factors or firm and country characteristics (ownership concentration, political institutions, and globalization): firms from common law countries have lower CSR than companies from civil law countries, with Scandinavian civil law firms having the highest CSR ratings. Evidence from quasi-natural experiments such as scandals and natural disasters suggests that civil law firms are more responsive to CSR shocks than common law firms.THE CLASSICAL VIEW IN FINANCE on modern corporations takes a shareholder value maximization perspective, which holds that corporations are accountable only to profit-maximizing shareholders, and apart from their contractually determined obligations, have no responsibility to serve other stakeholders' interests or to enhance society's welfare (Friedman (1970), Bénabou and Tirole (2010)). In reality, however, corporations often focus on objectives beyond profit maximization and participate in activities that improve other * Hao Liang is from Singapore Management University. Luc Renneboog is from Tilburg University. We acknowledge that we are aware of the Journal of Finance's submission guidelines and policies and conflict of interest disclosure policy and that there are no conflicts of interest that exist for this paper. We are very grateful to Andrei Shleifer and Holger Spamann for comments and suggestions on early versions of the paper. We also wish to thank