Motivational factors are driving forces that stimulates a person, which gingers an urge or passion to pursue a certain action. Most employers would appreciate to have a motivated worker who is ready to work, but do not understand what truly motivates each individual. Hence the study focused on extrinsic motivational factors and job performance of library personnel in universities and institutes of agriculture in Nigeria. It is an empirical study whose major source of data was primary source through questionnaire. The main objective is to detect the extrinsic motivational factors and job performance of library personnel. A total of four hundred and seventeen (417) copies of questionnaire was administered to the library personnel in universities and institutes of agriculture and four hundred and eleven (411) were returned and found suitable for analysis. It is a survey research and the data collected was analyzed with frequency counts, percentages, mean, and standard deviation while linear regression was used to analyze the influence of extrinsic motivational factors on job performance of library personnel. The result of the findings indicated that extrinsic motivational factors influences the job performance of library personnel in universities and institutes of agriculture in Nigeria. The findings also revealed that the level of job performance of library personnel was high. The study therefore recommends and concludes that for any organisation to succeed and keep growing, adequate provision must be made towards what motivates its employees and implementing them.