This study is an enquiry into the potency of Motivation and job performance as a tool to enhance library personnel effectiveness in discharge of their duties. The method used for data collection was fact finding interviews and questionnaires. Two (2) Hypotheses were used for this research and most interestingly they were all proved to be true. Findings show that the problem of inefficiency would be encountered if staff are not motivated and that the most popular means of motivation is the financial method. Reward systems that include job enlargement, job enrichment, promotions, awards, monetary, and non-monetary compensation were considered. It was discovered that motivation is of prime importance in motivating library personnel; university librarians should continually motivate them, for effective job performance in University libraries.