Drawing on the social network theory (Moreno and Jennings, 1934) and reciprocal norms (Gouldner, 1960), we developed and tested the multilevel model examining the interaction effects of shared leadership on employee creativity under inevitable competition circumstances among team members. Although shared leadership has been widely known to be able to encourage follower performances, it is also faced with the challenges of different contextual elements. We propose that shared leadership will promote employee creativity through knowledge sharing and knowledge hiding behavior. Finally, we predict a moderated-mediation effect of shared leadership and team psychological climate (TPC) on employee creativity through knowledge sharing and knowledge hiding. In particular, a high shared leadership team enhanced employees’ knowledge-sharing behavior and conversely suppress knowledge-hiding, especially for those who rated competitiveness among team members low (i.e., team psychological climate), and vice versa. We performed two multisource time-lagged field study designs in the westernmost region of Indonesia. Using two samples of 151 agents of 40 professionals work teams (Study 1) and 426 full-time academics from 112 study programs of a large public university (Study 2), we found consistent support from both studies. The theoretical and practical implications of the findings are discussed.