The quality of secondary education in Nigeria is largely dependent on the level of teachers’ professionalism and instructional efficiency. In recent years, concerns have been raised regarding declining teaching standards, inadequate professional commitment, and reduced instructional effectiveness in secondary schools. This paper examines the need to reposition teachers’ professionalism and efficiency as a strategic pathway to achieving quality secondary education in Nigeria. Drawing on relevant literature, policy documents, and empirical evidence, the study adopts a descriptive and analytical approach to explore key dimensions of teacher professionalism, including qualification, continuous professional development, ethical conduct, pedagogical competence, and classroom management skills. The paper argues that professionally grounded and efficient teachers are central to improved students’ academic performance, positive learning outcomes, and the overall attainment of national educational goals. It further identifies major challenges undermining teachers’ professionalism and efficiency, such as inadequate training opportunities, poor motivation, insufficient supervision, and unfavorable working conditions. The study emphasizes the role of government, school administrators, and professional bodies in strengthening teacher education programmes, promoting continuous capacity building, enforcing professional standards, and improving teachers’ welfare. The paper recommends deliberate policy interventions aimed at teacher empowerment, institutional support, and effective monitoring mechanisms as essential strategies for improving educational quality and national development.