This study adopts the Theory of Planned Behaviour as an underlying model to investigate its relevance, by examining the link between attitude, subjective norm and perceived behavioural control to account for whistle-blowing intentions. The data were analysed using a structural equation modelling (SEM) technique with the use of Partial Least Square approach (PLS). Using a sample of 262 Malaysian police officers, the analysis showed that TPB provides a sound framework for predicting both internal and external whistle-blowing intentions. Additionally, both internal and external whistle-blowing intentions are significantly influenced by attitude. Subjective norm is found to positively influence internal whistle-blowing intentions, while perceived behavioural control positively influences external whistle-blowing intentions. Hence, it is hoped that the results of this study will be a useful source of information to law makers, policy makers, institutions, management and the like in supporting whistle-blowing practices and thus enhancing accountability and strengthening good corporate governance in work places.