This article presents a theory of managerial intelligence, as well as data to support the theory. First, the article opens with a general discussion of managerial intelligence. Second, it describes two alternative models, a traditional and a nontraditional one, of intelligence as applied to managers. Third, it discusses why construct validation, rather than just predictive validation, is important for selecting a theory and corresponding measure of managerial intelligence. Fourth, the article discusses the relevance of a three-part, “triarchic” theory of human intelligence as applied to managerial performance. Finally, the article draws some general conclusions about what makes a person managerially intelligent.