This paper discussed information communication technology (ICT) literacy as the relative measure of library staff's capacity to make appropriate use of ICTs for information acquisition, organization, retrieval and dissemination. It also examined the impact of Information and Communication Technology (ICT) literacy on the duties of library staff in selected federal university libraries in Nigeria. The research employs a purposive sampling technique to select six federal universities one each from the six geopolitical zones in Nigeria. Questionnaire was used for data collection which yielded a 79.7% response rate. A major finding of the study revealed that over 60% of the respondents were competent in sending emails, use of search engines, the use of Microsoft application software such as Ms Word and Ms Power Point. The study concluded that the level of ICT literacy competence among the library staff in the Nigerian federal university libraries studied is on the average