This article presents a theoretical justification and a proposal that seeks to educate university students in leadership through virtues and personal competencies. A distinction is offered between virtues and competencies without opposing them. Subsequently, a leadership education model based on virtues and personal competencies is offered. This proposal applies the Aristotelian-Thomistic tradition of education in virtues considering the contributions of psychology and leadership theory. The leadership model includes eight competencies linked to the cardinal virtues, which are grouped into three domains: understanding reality, relating to others and dedication to the task. Finally, some guidelines for the further development of assessment instruments and for leadership education of university students are offered.