Social media has played an increasing role in tourist decision through ideas, opinions, and experiences shared on social media platform. In fact, more and more tourists used information shared on social media to make decisions relating to their trips (Lee, 2012). Among different age groups of tourists, Gen Z has been considered social media apps as a crucial part of their daily lives (Zhang, 2020). In fact, Gen Z tend to use around around ten hours daily online (Pathak-Shelat, 2014). Vietnam is within the golden age since Gen Z contributes for a large propportion (21%) of the population. That means, Gen Z customers and tourists play a vital role in Vietnamese social and tourism development. This paper, therefore, aims to investigate the impacts of social media on intention to choose a destination of Gen Z tourists. In this paper, impacts of social media will be investigated based on 3 factors, namely information on social media, utilisations of social media for tourism services, and influence of others on social media. Primary data collected from 300 Gen Z tourists coming from all regions of Vietnam was used in this paper. Cronbach Alpha, descriptive statistics and regression has been used as research methods in this study. The results show that information on social media and influence of others on social media has significant and positive influence on intention to choose a destination of Gen Z tourists. The study could not find evidence supporting for the significant impacts of utilisations of social media for tourism services on intention to choose destination of Gen Z tourists.