Emotional intelligence (EI) plays a key role in enhancing managerial effectiveness, particularly in dynamic work environments. This study adopts a quantitative, data-driven approach to examine five core EI dimensions—self-awareness, self-regulation, empathy, social skills, and motivation—and their associations with managerial performance. A cross-sectional survey of 250 managers across multiple industries was analyzed using weighted least squares regression and structural equation modeling (SEM). Positive associations between emotional intelligence and managerial effectiveness were observed in both descriptive and correlational analyses. The results reveal that empathy and motivation are the strongest predictors of managerial effectiveness, while interaction effects, particularly between empathy and social skills, highlight the synergistic impact of combined emotional competencies. The findings suggest that EI functions as an integrated competency rather than a collection of isolated traits, enabling managers to lead effectively and navigate complex work environments. Practical implications include integrating EI training into leadership development and performance management systems. This study provides a solid basis for further developing emotionally intelligent leadership and confirms the importance of emotional abilities in addressing contemporary managerial challenges.