The study focus mainly on the cognizance of collective bargaining and its benefits in relation to teacher's welfare and working condition in public secondary school in Delta State, Nigeria. Two research questions were asked and answered in regard to the extent of awareness of Delta State public secondary school teachers of the principle of collective bargaining and the benefits of collective bargaining in public secondary school in Delta State. One hundred and twelve teachers were randomly selected from fourteen secondary schools in Delta Central Senatorial District in Delta State, Nigeria. The questionnaire which was rated on a five point Likert Scale was administered as the main instrument and the reliability coefficient was 0.90. Descriptive statistical procedures were employed in the analysis of data. The study revealed that the awareness of collective bargaining in public secondary school in Delta State was moderate as the respondents were not all members of the teachers' union. The resolution of issues relating to better working conditions, welfare, promotion, recognition and reward of staff were done through collective bargaining. Furthermore, some of the benefits revealed from findings of the study were better working condition, staff welfare, recognition and promotion. The study recommends that teachers should have better and clear understanding of collective bargaining; finding out their grievances and discussing various issues leading to addressing general school disputes and not just focusing on wage increment only.