The 4.4% prevalence of adult HIV infection makes Nigeria the nation with the third highest HIV/AIDS infection worldwide. Librarians, as gatekeepers of information, ought to be active participants in the awareness campaign against HIV/AIDS. The knowledge and attitudes of librarians about HIV/AIDS will influence how effectively they can fulfil the expected role. The purpose of this study is to assess the level of knowledge, attitudes, and awareness of sources of information about HIV/AIDS among librarians in Nigeria.