This research examined the relationships among emotional intelligence, positive and negative affect, and suicide ideation between Spanish adolescents in a 4-month follow-up study. Adolescents (N = 1,174) from Southern Spain completed an emotional intelligence scale and, 4 months later, 818 of them completed scales measuring affect and suicide ideation. Mediation analyses revealed that both positive and negative affect were significant partial mediators of the prospective relationship between emotional intelligence and suicide ideation. Overall, our findings support the role of emotional intelligence in suicidal thoughts, suggesting that emotional intelligence may reduce suicide ideation in part through its effects on affectivity.