This research is intended to identify the dimensions and components of the competencies of the chief justices in Iran. This is a mixed research. In the qualitative phase, the sample is selected purposively through snowball method containing 21 judges and experts of the Iranian judiciary who participated in the interviews. Data analysis is performed by qualitative content-analysis method. Purposeful and snowball sampling was used in the qualitative part of the research. Finally, 21 law experts were interviewed. Content analysis method was used to analyze the interviews, while a questionnaire and structural equation analysis were used in the quantitative part through random sampling. The findings of the qualitative section illustrated that the main components of chief justices contain individual competencies, judicial competencies, managerial competencies, and extra-organizational competencies. Moreover, the quantitative results of the study demonstrated that the sub-variables of the study were classified in terms of importance as follows: intelligence, judiciary intuition, perceptual skills, control of the environment, courage, judicial knowledge, strategic thinking, seeking excellence, negotiation and communication skills, targeting, knowledge of law, management of political behavior, environmental awareness, chastity, social capital, meritocracy, ethics, step-by-step appointment, order and fairness, commitment and justice, faire citizenship behavior, supervision and control, judicial ethics, modeling and planning.