An exploratory study of the emotional intelligence (EI) of student leaders participating in a Supplemental Instruction (SI) program was conducted to determine whether a significant relationship exists between leadership effectiveness and EI as measured by the Bar-On Emotional Quotient Inventory (EQ-i) and to assess the impact of the leadership experience on EI scores through pre- and post-testing. The results revealed a statistically significant difference in the Total EQ-i of the more effective leaders as compared to the others. The more effective leaders also scored higher on all the EQ-i subscales, with the differences on Social Responsibility, Impulse Control, and Reality Testing being statistically significant. As for changes in EI, only the scores on the EQ-i Problem Solving subscale increased significantly between the pre- to post-testing sessions. Implications for practice and future research are addressed.