This study aims to examine the factors influencing consumers' behavior intention to adopt mobile banking apps. The research uses the TAM model with additional variables such as social influence and perceived risk to evaluate how these factors impact the behavior intention of young customers toward adopting mobile banking services. PLS-SEM was used as the main research method. The findings from this paper reaffirmed that perceived usefulness and social influence are the most influential factor in behavior intention, but perceived ease of use and perceived risk showed insignificant impacts on young consumers' behavior intention in Vietnam. This paper also found that perceived ease of use had no direct impact on behavior intention but an indirect impact through facilitating perceived usefulness. This subject makes a practical and academic contribution in the context of a developing country where is lacking research in mobile banking apps.