Generation Y forms the majority of today’s workforce. In this respect, it is important for organizations, researchers, and practitioners to reveal the factors that increase the task performance of Generation Y. This study investigates the effect of intellectual competencies, one of the qualities that Generation Y values and wants to see in their managers, on their extra-role behavior and task performance. The study adopted the conveient sampling method and was conducted with 356 participants from Generation Y, who work in various sectors. The statistical analyses were performed on the collected data and findings interpreted. The results show that the strategic perspective and analysis, and Vision dimensions of intellectual competencies have a significant and positive effect on the task performance of Generation Y. The results also show that benevolence and civic virtue dimensions of extra-role behavior play a full mediator role in this effect.