The study is aimed at determining how structured supervision of influences work attitude and promotes job performance in universities. This is because the success of any academic institution depends on effective supervision of staff. To achieve the objectives, the study adopted survey research design using interviews and questionnaire. Respondents (107) were selected from different units/departments of a public university in Nigeria through stratified sampling technique. Data were analyzed using descriptive statistics. The study revealed that Junior Non-Academic Staff of the university were poorly supervised, leading to poor job performance. The cause of this is non-application of structured supervision. The study believes in structured supervision, which involves elimination of harsh supervision, enthronement of cordial relationship between workers and their supervisors, regular training of supervisors, promotion of exemplary supervision, and provision of institutional policy on supervision. Therefore, there is a strong relationship between structured supervision and high job performance. As a result, it is important that supervisors are regularly trained to imbibe spirit of structured supervision which will help them to lead their subordinates to achieve high job performance.