This study examines research topic selection among LIS postgraduate students in Tanzania. A quantitative approach was used to collect the data, and purposive sampling was used to recruit a total of 105 respondents. Key findings showed that research topic selection is influenced by how extensively the topic has been researched, postgraduates’ personal interests and whether the topic has been previously researched by a student. Insufficient research knowledge, little global LIS research exposure and insufficient supervisory leading roles affect research topic selection. Findings showed male and doctorate postgraduate students face more challenges in LIS research topic selection. The study concludes that LIS postgraduates’ research topic selection is challenging due to insufficient research methodology training and foundations. The study suggests research methodology training for supervisors and students, revising LIS curricula and appropriate research guidance to LIS postgraduates would be important in addressing the challenges found. The study also recommends the establishment of an LIS national repository centre with research content accessible to all students.