The triarchic model of psychopathy replaces a syndromal view of this pathological personality condition with a tripartite trait-based conception, positing three distinct phenotypic dispositions as building blocks for what theorists have traditionally termed psychopathy. The Triarchic Psychopathy Measure (TriPM) offers an efficient means for measuring the three dimensions to facilitate research on the model’s validity. We tested the reliability of the TriPM as well as its convergent and discriminant validity with respect to differing models of personality and other criterion variables reflecting social-emotional adjustment and mental health in an undergraduate participant sample (n = 120). The TriPM evidenced excellent internal consistencies, good test-retest reliability, and strong validity consistent with the triarchic model. We discuss the results with respect to prior research and offer suggestions for future research on the validity of the TriPM and the triarchic model.