This study examined postgraduate library users' satisfaction with reference and user education services at the University of Port Harcourt Library. A descriptive survey design was used for the study and the population of the study was composed of 1,008 registered postgraduate students in the University of Port Harcourt Library in the 2020-2021 session. A simple random sampling technique was used to select a sample of 150 postgraduate library users out of the population. A 15-item four-point rating scale questionnaire was administered to 150 PG. users by the researchers and an assistant, 108 were successfully retrieved. Mean and standard deviation were used to analyze the data. Findings of the study showed that post-graduate students’ library users are satisfied with the reference and user education services offered by the University of Port Harcourt library with mean scores above 2.5 criterion mean except for some specific functions such as information literacy and lending of information materials that were below the criterion mean of 2.5. Some factors such as unqualified personnel, poor facilities, lack of technological skills and funds were revealed as militating against effective reference and user education delivered to students in the library. Based on the findings, following recommendations were made, students should be encouraged to access the references and services of the library because the service is satisfactory and librarians should improve on their lending service and information literacy instructions to users. Also, efforts should be made to provide qualified personnel with regular framing, improve infrastructure among others to enhance effective reference and user’s education services delivery to users.