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The study was designed to investigate the factors driving the academics to engage in work-related knowledge sharing activity using a conceptual model adapted from Theory of Planned Behaviour (TPB) of Ajzen (1991) and the two affective components (affective commitment and affect-based trust). A descriptive survey research design covering academics in all departments of the five faculties in The Polytechnic, Ibadan was employed.The literature review covered knowledge management KM, knowledge sharing KS and knowledge sharing behaviour KSB. Self-structured questionnaire based on the adapted model were administered as data collection instrument. Complete enumeration survey study was carried out because the total study population was about 346 lecturers and the same copies of questionnaire were distributed to the academics across the five faculties of the polytechnic of which 235 copies were returned. The data was analysed using descriptive and inferential statistics.Academics of The Polytechnic, Ibadan will be willing to share their work-related knowledge if both the factors encouraging and inhibiting sharing of knowledge with their colleagues are adequately addressed.The result shows, on one hand, that perceived behavioural control (.000) and affective commitment (.000) were significant predictors of intention to share knowledge while attitude (.066), subjective norm (.308) and affect-based trust (.694)are not.On the other hand, academics’ intention to share knowledge (.000) significantly predicted academics’ knowledge sharing behaviour.The study further concludes and recommends that more group activities should be encouraged and collaborative teaching and research should be emphasized to further promote knowledge sharing among academics.Further studies could focus on a comparative study between or across two or more federal, state and/or private polytechnics.