Abstract
This study established the effect of occupational stress on performance of non-academic staff of tertiary institutions in Lagos State, Nigeria. Specifically, the study examined the effect of role ambiguity, role conflict and the poor working conditions on non-academic staff of tertiary institutions in Lagos State. The study adopted a descriptive survey design and the population covered all 228 non-academic employees of Federal Technical College of Education, Akoka, Yaba College of Technology, Yaba, and Lagos State University of Education, Ijanikin. The sample size was 145 which were determined using Yamane sampling model. Descriptively, frequency and percentage were used to analyze the bio data of the respondents while regression analysis was used to analyse data collected. The estimation techniques are R-square, F-statistics and P-value. The results of the analysis discovered that role ambiguity, role conflict and poor working conditions have positive and significant effect on performance of non-academic staff of tertiary institutions in Lagos State. In relation to the findings of this study, it was concluded that occupational stress has a significant impact on how well employees execute their jobs. It is, therefore, recommended that the role of non-academic staff of tertiary institutions must be cleared to them, content must be explicit to guide against stress and conflict in the workplace. Institutions should also implement management programmes aimed at controlling and minimizing the level of stress that employees experience.