The inability of teachers to timely cover the scheme of work, students' truancy and persistent lateness to school, poor attitude towards teaching and learning, activities of cultism and frequent conflicts among secondary school students in Enugu State prompted this study to determine the administrators' managerial competencies for sustainable human resource management in secondary education in Enugu State. Two specific purposes were formulated and two research questions guided the study. The study adopted a descriptive survey research design. The study population comprised all the 291 secondary school principals in Enugu State. Simple random sampling technique was used to sample 146 principals for the study. The instrument used for data collection was a 19 items researchers' developed instrument titled; "Administrators' Managerial Competencies for Sustainable Human Resource Management Questionnaire" (AMCSHRMQ). The face validation of the instrument was established by three experts, two from the Department of Educational Management and Policy and one from the Department of Educational Foundations (Measurement and Evaluation Unit), Nnamdi Azikiwe University, Awka. The Cronbach alpha was used to determine the reliability of the instrument. Coefficient value of 0.71 was obtained. Data were analyzed using mean and standard deviation. Findings of the study revealed among others that secondary school administrators lack managerial competencies for students' human resource management by not providing counseling services to students regarding their learning process, providing incentives for students to increase their motivation to learn among others. Based on the finding, it was recommended among others that student human resource management should be incorporated and emphasized in the training guide for educational administrators in order to make them develop more suitable students centered policies in their various schools. Conclusion was drawn based on the findings.