The study of social psychology frequently examines how individuals' perceptions of identity within a group influence collective decision-making processes. This paper explores the impact of collective identity on group decision-making and the associated social influence mechanisms. Our objective was to investigate how diverse cultural backgrounds and social constructs affect group dynamics and outcomes. We employed a mixed-methods approach, combining quantitative surveys with qualitative focus group discussions, among culturally diverse participants from three universities. Our findings indicate that collective identity significantly affects conformity levels, with cultural context playing a mediating role. Specifically, individuals from collectivist cultures exhibited higher conformity in group decision-making, whereas those from individualist contexts demonstrated greater resistance to social pressures. The qualitative data provided further insights into the underlying reasons for these differences, highlighting the role of cultural norms and values. We conclude that understanding the nuances of collective identity is crucial for fostering effective group interactions across multicultural settings. This research has implications for organizational behavior, particularly in multinational teams, where acknowledging and integrating diverse social identities can enhance collaboration and innovation.