Commitment is crucial to the survival and fulfillment of any academic library’s mandate. Unfortunately, high personnel turnover and mobility appear to have characterized academic libraries in Nigeria. Could this be because they are not motivated enough for them to remain committed to their libraries? Hence this study explores the relationship between personnel motivation and organizational commitment in academic libraries in Lagos State. A survey research design was used. The population consisted of 224 personnel in academic libraries in Lagos State. Using total enumeration all 224 library personnel participated in the study. For data collection a questionnaire was used. A response rate of 81% was obtained. Data was analyzed using include descriptive statistics, Correlation and linear regression analysis. The findings revealed that on the overall, library personnel had average level of commitment (mean=2.73). However, there appear to be more of Affective Commitment (mean=2.88), followed by Normative Commitment (mean=2.82) and then Continuance Commitment (mean=2.48). Library personnel motivation was at an average level (mean=2.95). The tested hypothesis revealed that motivation is not significantly related to Commitment (r=0.09, P>0.05). This may imply that other factors other than motivation are responsible for organizational commitment. Organizational commitment remains pertinent to fulfilling the mandate of any academic library. Therefore, policies and programs that will help maintain the affective commitment of its personnel and work towards improving normative commitment and continuance commitment should be put in place.