This paper investigated the link between organizational commitment and job performance of university lecturers in Delta State University, Nigeria. Specifically, the relationship between the organizational commitment dimensions of affective, continuance, and normative commitment and job performance of university lecturers in Delta State University was explored. The study adopted the survey research design. The population of this study consists of all categories of lecturers in Delta State University, Delta State. A sample size of three hundred respondents which were selected using the convenience sampling technique was used for the study. The data generated in the study were analysed using frequency tables, percentage, mean, and multiple regression. The Statistical Package for the Social Sciences (SPSS) version 23.0 was used for data analysis. All analyses were carried out at 5% level of significance. The study found that all the organizational commitment dimensions investigated, that is, affective commitment, continuance commitment and normative commitment have a direct influence on the job performance of university lecturers. The study recommended that the management of universities in Nigeria should positively stimulate the attitudes and behaviour of their employees through the implementation of a comprehensive, equitable and attractive incentive system for all categories of lecturers; and improve the conditions of work and service of university lecturers.