The study investigated marketing of library services as a determinant for undergraduate’s patronage in Oghara Polytechnic library in Delta State, Nigeria. The study adopted a descriptive survey research design using questionnaire as instrument for data collection. The population of the study consists of 31 library staff at the Oghara polytechnic library. A total of 31 questionnaires were distributed only 25 were retrieved. Data collected were analyzed using descriptive statistics mean and percentage mean score of 2.5 and above. The study revealed that the needs for marketing library and information services in Oghara polytechnic libraries is keeping the clients in touch, informed about resources and services that match their interests, aims at determining the needs and aims at determining the wants and demands of undergraduates. The study shows the current techniques employed in marketing library services as library website, orientation tours and workshops, blogs and podcast, and posters. The study affirmed the extent of undergraduate’s patronage as once in week, twice a week and during exams. The study recommended that the library management should utilize social media to market their information resource and services to increase undergraduate’s patronage, the library staff should improve their relationships with their users so as to portray a good image of the library to their users.