Despite clear calls from industry to better understand cross-cultural leadership competencies, academic research on leader cultural intelligence (CQ) is remarkably sparse. To date, very few empirical studies have examined the unique contribution of leader CQ to leadership performance outcomes beyond the effects of competing leadership competencies. Data from 99 culturally diverse organizational leaders and 321 of their followers demonstrated that leader CQ predicted follower perceptions of leader performance and team performance in contexts where work teams were characterized by significant ethnic and nationality diversity. Furthermore, leader CQ predicted follower perceptions of leader performance and team performance on culturally diverse work teams beyond the effects of leader emotional intelligence and other leadership competencies. Implications for cultural intelligence theory, future research directions, and management practice are discussed.