This study is to analyze the impact of ownership concentration and of various types of shareholders on the risk-taking behavior of Vietnamese joint-stock commercial banks using a panel data of the period 2010-2017. In line with the literature, results from a panel regression with fixed effects show that as the ownership concentration increases, the risk-taking behavior of the bank also increases. With regard to the impact of various types of shareholders, the results show that the institutional and foreign shareholders ownership can reduce the bank risk-taking behavior. CEO and individual shareholder ownership also seem to have a negative impact on the bank risk-taking behavior, however the statistical test does not support for this relation. Findings from this study are supported by the real situation of the Vietnamese economy. From these results, a number of policy recommendations are put forward.