A protean career attitude is considered as an important determinant of career success in the contemporary career era. In this article we test a model in which we specify the relationships between protean career attitude, career self-management behaviors, career insight, and career success outcomes (career satisfaction and perceived employability). A survey was conducted among a sample of 289 employees. The results support the idea that a protean career attitude is a significant antecedent of career success and that this relationship is fully mediated by the development of career insight. The implications of these findings for understanding the process through which career attitude affects individuals’ career success are discussed.