Over the past few decades, scientists have increasingly collaborated with colleagues in what is known as a research team, as scientific issues have grown more complicated and scientific knowledge and methodology have improved. This study's main objective was to assess implicit assumptions of how shared leadership and team cohesion evolve to establish the effectiveness of research teams. Individuals from various research teams in universities and research institutions in Indonesia (n=240) participated in a questionnaire study using SEM_PLS to test the hypotheses. The findings concluded that there is a strong relationship between team effectiveness and shared leadership. The implementation of shared leadership within research teams has been shown to improve team cohesion, which in turn enhances overall team effectiveness, particularly in terms of member satisfaction, commitment, and team viability. The role of task interdependence had a negative and insignificant effect as a moderator between shared leadership and team effectiveness