Library instruction plays a vital role in facilitating the patrons in imaginative and artistic thinking about research and information resources. In the present technological era, libraries need to interact with the patrons more in order to help them in locating the information resource and organizing the resources in such a way that the patrons can find their information with assistance. This study investigates the effectiveness of library instruction among the Post Graduate students in Bharathidasan University. The study adopted a survey method and structured questionnaire was used to collect data from the respondents. The Study found out that majority of the students were able to make use of the library resources and services without much help of the library staff.