This study examined a relational analysis of the usability features of university library websites in Nigeria. Through a survey design, a sample of 187 undergraduate students enrolled in a course on Web Design and Management participated in the study. The findings revealed that the usability of a university library website is premised on factors such as navigation, interface design, page layout, information architecture, graphics, typography, color attractiveness, and interactivity. Eight variables explained 52.3% of the variance in the usability features of university library websites. Navigation contributed mostly to the prediction of usability perception of the library website, followed by interface design, page layout, information architecture, graphics, typography, color attraction, and interactivity.