PurposeFor the past two decades, intellectual capital has played an increasingly important role in firm performance around the world. However, the importance of intellectual capital in Vietnam, and especially in the banking sector, has largely been ignored in the literature. This study is the first to examine the effect of intellectual capital on bank performance in Vietnam. In this paper, intellectual capital is decomposed into three components: (1) capital employed efficiency, (2) human capital efficiency and (3) structural capital efficiency.Design/methodology/approachThe paper uses an unbalanced panel dataset on 14 listed banks in Vietnam for the period 2009–2018 for which required data are available, with the generalized method of moments.FindingsThe findings indicate that intellectual capital contributes significantly and positively to bank performance in Vietnam. In addition, bank performance is driven primarily by capital employed efficiency. Although human capital efficiency appears to contribute positively to bank performance, the effect on bank performance appears to be marginal.Originality/valueThe literature review indicates that the effect of intellectual capital on bank performance is mixed. This effect can be positive or negative or even show a U-shaped relationship. The effects of intellectual capital on firm performance are not consistent, depending on factors such as the quantitative technique and sample used. As such, this paper extends analysis of Vietnam to cover the 10-year period from 2009 to 2018. The literature review reveals that the contribution of intellectual capital to bank performance has largely been ignored in the context of Vietnam. Studies have been conducted on the Gulf countries, such as Buallay et al. (2020). However, because the context in Vietnam differs from that of the Gulf countries, their experience might not be relevant to Vietnam. Vietnam is an emerging market in Southeast Asia, whereas Gulf countries have high income levels. So, it is necessary to examine direct evidence on Vietnam.