We investigate whether corporate social responsibility (CSR) ratings affect the syndicated loan spreads paid by European listed firms. By performing ordinary least squares (OLS) pooled regressions on a sample of 1101 syndicated loans granted to European companies, we find evidence that borrowers’ CSR ratings have a significant impact on loan spreads. However, the relationship between CSR ratings and loan spreads is quite complex. Low CSR-rated firms pay higher loan spreads than better CSR-rated firms, but high CSR ratings are not always rewarded by lenders. The benefits of a high CSR rating level are significant only for firms located in countries that pay great attention to sustainability issues. Overall, our work provides a key to reconciling the mixed results obtained in the empirical literature, as we find evidence of a significant lack of homogeneity within the European Union countries regarding the relationship between CSR performance and the cost of debt financing.