This study examines antecedents of trust formation in new product development (NPD) teams and the effects of trust on NPD team performance. A theoretical framework relating structural and contextual factors to interpersonal trust and project outcomes was built, including task complexity as a moderating variable. Hypotheses from this model were tested with data on 93 product development projects carried out in Turkey. The findings showed that structural factors such as moderate level of demographic diversity, proximity of team members, team longevity, and contextual factors (procedural and interactional justices) were positively related to the development of interpersonal trust in NPD teams. The findings also revealed that interpersonal trust had an impact on team learning and new product success, but not on speed-to-market. Further, the findings showed that the impact of interpersonal trust on team learning and new product success was higher when there was higher task complexity. Theoretical and managerial implications of the study findings are discussed.