This study aims to investigate the factors that influence corporate social responsibility disclosure (CSRD) in the banking sector in an emerging country. The quantitative model is estimated for a sample of banks in Vietnam for the period from 2013 to 2019. To explain the determinants of CSRD in banking, regression analysis using panel data was employed while taking bank size, bank age, financial performance, state ownership, and regulation as independent variables, and CSRD as a dependent variable. The results revealed that bank size, bank age, and regulation have positive impacts on CSRD, whereas state ownership has a negative impact, and financial performance was found to be insignificant. This study enriches the knowledge of CSRD, and it contributes empirical evidence of the impact of bank characteristics on CSRD. Particularly, empirical evidence suggests that regulation is an effective instrument for promoting the CSRD of banks in Vietnam. Therefore, the study identified the need for government regulation to increase disclosure because voluntary disclosure does not seem to be sufficient to achieve the desired results.