This paper focuses on the impact of trust and risk on forming behavioural intentions to use sharing economy platforms. Also, we investigate the interplay between risk, trust in and intention to use sharing economy platforms, as well as the antecedents of trust in this context. The study found strong support for the impact of trust on behavioural intention, and the mediating role of perceived risk. We also identify differences regarding the role of social influence on trust among the two studied platforms (Uber and Airbnb). The results have implications for trust research as they merge technology acceptance and e-commerce research.