This study explored demographics and job performance of sectional heads of libraries in Delta State, Nigeria. Correlational research design was adopted for the study. The population consisted of 29 sectional heads of libraries. A total of 29 copies of questionnaire were distributed but only 25 were filled and returned. Pearson’s Product Moment Correlation coefficient was used for analysis of data collected. The findings revealed week negative relationship between age and job performance of respondents; there was weak negative relationship between gender and job performance; weak negative relationship between work experience and job performance of respondents; weak negative relationship between educational qualification and job performance of respondents. The study recommended that the university management should consider the age-range of staff when appointing sectional heads and ensure that staff who are mature to handle sensitive section of the library are handed the responsibility and that the university library management should consider experienced hands when appointing sectional heads among others.