A quiet environment is essential for any meaningful academic work to be achieved in a university library. This paper, therefore, assessed the level of noise in federal university libraries in Nigeria to determine the extent to which it affects undergraduate students’ use of the university libraries. The survey research method was used for the study and the study population was 1,453 undergraduates from across Arts, Education, Engineering, Law, Science and Social Science faculties in the selected universities. The main instrument used for the data collection was a questionnaire. Descriptive statistics such as frequency and percentage tabulation were used in analyzing the data. Results revealed that level of noise in Nigerian federal university libraries is high and this has negative effect on undergraduate students’ use of the university libraries. To minimize the level of noise in Nigerian federal university libraries, majority of the respondents indicated the need for library management to instruct library users to put their mobile phones on silence whenever visiting the library, enforce rules and policies that would reduce noise- making in the libraries and cover the floor of the libraries with noise absorbing materials.