Corruption is one of the enemies of Nigeria while campaign against corruption has been one of the focuses of President Muhammadu Buhari since his coming into power on May 29, 2015 and it is on this thrust that the study examines the influence of mass media in the fight against corruption in Nigeria because the media is seen as the fourth estate of the realm and watch dog of the people in political offices. There is no gaining saying in the fact that mass media have not relented in exposing corrupt leaders with establishment of various anti graft agencies such as the EFCC, ICPC, CCT and the Nigerian Police. The study used survey method in carrying out this research with the use of questionnaire as a research tool. The data collected were analysed using descriptive statistics (frequency percentage and tables). The study find out that mass media have been a major instrument in waging war against corruption and corrupt practices in Nigeria. The media are performing significant roles in the anti corruption campaign. It is therefore, recommended that mass media should be objective in their coverage and reportage of corrupt matters without political or ethnic influence.