This study was conducted to determine the relationship that exists between motivational factors (remuneration, work environment, promotion and training) on librarian’s job performance in federal university otuoke and Lagos state university libraries. To achieve the objective, research question with corresponding hypothesis was formulated to give direction to the study. The correlation research design was used for the study. The population of the study consisted of 18 librarians drawn from federal university otuoke and 18 librarians from Lagos state university libraries. 36 librarians used for the study, and no sample size due to the small population. Data was collected using researcher’s developed instruments titled ‘Motivational Factors and Librarian’s Job Performance Questionnaire’ (MFLSJPQ). The instrument was found reliable with a reliability coefficient of .714 using Multiple Regression Coefficients. Data collected were analyzed using Pearson Product Moment Correlation Coefficient to answer the research question while Multiple Regression Coefficient was used to test the hypothesis at 0.05 level of significance. The findings from the data analysis showed that the motivational factors being (remuneration, work environment, promotion and training) have significant influence on librarians’ job performances in federal university otuoke and Lagos state university libraries. Upon the findings, it was concluded that remuneration, work environment, promotion and training determine the relationship that exists between motivational factors and Librarian’s Job Performance in federal university otuoke and Lagos state university libraries. Consequently, it is recommended that Governments and parent institutions should provide good salary packages and additional incentives in order to motivate librarians to be committed and dedicated to their required duties. Also, government should provide librarians with adequate remuneration, conducive work environment and regular promotions as well as in-service-training, they will be committed and dedicated to their duties effectively and efficiently, and this would elicit higher productivity from them.