This project looks at Communication and behavioural changes – a case study of people’s perception of the awareness campaigns on HIV-AIDS in Nigeria. In this study, an attempt was made to examine whether communication has an effect on people’s behavioural change especially on the perception of HIV/AIDS in Nigeria. Questionnaires were administered among randomly sampled respondents from the study population. The data obtained were analyzed using a table and some findings were formulated to direct the study were accepted. Thus, there is a significance of mass media communication to people”s perception of HIV/AIDS and increasing their knowledge about HIV/AIDS, raising awareness of personal risk factors and also teaches vulnerable individuals the skills needed to reduce risky behaviours. Having considered all the findings during this research project, it has been made evident that mass media communication has been doing up to the expectation to campaigning against HIV/AIDS and also changing people’s behavior concerning HIV/AIDS in Nigeria.