AQUINO Journal of Philosophy

Teachers' professional ethics constitute a fundamental pillar of educational quality and play a significant role in shaping students' academic outcomes, particularly in public secondary schools where teachers serve as the primary facilitators of learning and character formation. Despite continuous investments in educational reforms, concerns over declining students' academic performance have persisted, with growing attention directed toward the ethical conduct of teachers as a critical determinant of instructional effectiveness. This article examines the influence of teachers' professional ethics on students' academic performance in public secondary schools through a comprehensive review of theoretical perspectives and empirical literature. It explores key dimensions of professional ethics, including integrity, accountability, commitment to duty, professional competence, fairness, respect for learners, confidentiality, punctuality, and adherence to established codes of professional conduct. Drawing on ethical theories, professionalism theory, and social learning theory, the article argues that ethical behaviour among teachers enhances classroom management, promotes positive teacher–student relationships, strengthens students' motivation and engagement, and ultimately improves academic achievement. Conversely, unethical practices such as absenteeism, examination malpractice, favouritism, and professional misconduct undermine learning outcomes and weaken public confidence in the education system. The review further identifies institutional, administrative, and socio-economic factors that influence teachers' ethical practices and discusses policy measures necessary for strengthening professionalism within public secondary schools. The article concludes that fostering teachers' professional ethics through continuous professional development, effective supervision, enforcement of ethical standards, and supportive educational policies is indispensable for improving students' academic performance and achieving sustainable educational development. It recommends stronger collaboration among governments, school administrators, teacher education institutions, regulatory bodies, and other stakeholders to cultivate an ethical culture capable of enhancing teaching effectiveness and promoting quality education.

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