© 2019 International Union of Psychological ScienceThe purpose of this study is to examine the reported level of self-disclosure in online communication and understand the relationship between perceived interpersonal competence and self-disclosure in an online context, taking into account the moderating role of shyness. The study sample consists of university students (N = 585). Hierarchical multiple linear regression analyses revealed that, controlling for participants' online media use, shyness moderated the relationship between online self-disclosure and perceived interpersonal competence. Moderation results showed that the relationship between online self-disclosure and perceived interpersonal competence was weaker for individuals with higher levels of shyness, and stronger for those with moderate or low scores on the shyness measure. The study's implications and contributions to the existing literature are discussed.