This study examines librarians' perceptions, capabilities, and understandings of Big Data analytics in public sector university libraries in Karachi, Pakistan. To acquire the desired results, a survey was conducted and using a quantitative approach. The study's target audience was library administrators at public sector university libraries in Karachi, all of which are recognized by Pakistan's Higher Education Commission and chartered by the Sindh Government. All respondents were sent an e-mail inviting them to participate in the survey on their own time. This study is important because it fills a large vacuum in the literature about the perspectives of Karachi's public sector university librarians on Big Data analytics. The result shows that most of the academic librarians are familiar with the concept of big data and thought that they need to develop their skills for the use of big data analytics tools and the government should also provide a sufficient budget for the professional development of the library staff.