Ethics forms the foundation of human judgement about right and wrong behaviour, guiding individuals’ decisions and interactions. In the teaching profession, ethics assumes an even greater significance because teachers not only impart academic knowledge but also shape students’ moral awareness, attitudes, and habits. The teacher’s conduct—inside and outside the classroom—becomes a source of influence for learners who often regard teachers as role models. Ethical awareness and behaviour therefore play a crucial role in maintaining fairness, trust, and integrity in the educational environment. This paper examines how teachers’ professional ethics contribute to students’ academic development, how an ethical classroom environment can promote positive behaviour, and why ethical values must be integrated into teacher training. To situate the discussion in broader scholarship, a brief literature review summarises studies on ethics in education and their implications for teaching practice.