Shyness has been found to have a negative impact on creativity. However, little attention has been given to the underlying process of the relationship between shyness and creativity. On the basis of literature, we hypothesize that shyness has an indirect impact on creativity through creative process engagement. Two studies were conducted on undergraduate students (Study 1) and working adults (Study 2) to test the hypothetical relationship. Analysis on participants self-report showed that shyness was negatively associated with self-reported creativity as well as creative process engagement. There was a positive relationship between creative process engagement and creativity. More importantly, mediation analysis supported that shyness was indirectly linked to creativity via creative process engagement. Specifically, shy people are found to be less involved in creativity-relevant processes such as information searching and idea generation. The low level of creative process engagement, in turn, hinders their creativity. The findings not only lend support to the detrimental effect of shyness on creativity but also shed light on the underlying mechanism of the relationship.