Abstract
In this study, the institutional mechanisms for combatting corruption in Nigeria‟s public service were critically and empirically analysed by appraising the Economic and Financial Crimes Commission (EFCC) and Code of Conduct Bureau (CCB). Primary data which were obtained through the instrumentality of questionnaire only. This was subjected to a chi square analysis in other to determine the activeness, effectiveness and problems of the set up institutional mechanisms for combatting corruption. The study made use of two theories namely: Public Choice theory and Organisational Structure theory. However, the study revealed that the established institutional mechanisms have been both active and effective in carrying out their duties. Despite the institutions activeness and effectiveness, they face significant problems.The study recommends the independence of these institutions which would in turn affect the performance of the established institutional mechanisms.