The study examined the roles of the public library in promoting reading culture in Rwanda. A case study research design was used, with both qualitative and quantitative approaches. Data were collected using the triangulation method employing questionnaires, interviews, and observation. Quantitative data were analyzed using Microsoft Excel Office 2010. Thematic method of analysis was used to analyze qualitative data. The study findings indicate that the public library was being used by most library users for reading. Whereby, the majority utilized the library for the purposes of gaining knowledge and relaxation. Additionally, the results show that most of the respondents spend more than one hour in the library reading. The findings also show that most of the library users have habits of visiting the library on a weekly basis. Furthermore, the findings show that the major factors that hinder library users from reading in the library included long distances to reach the public library, financial constraints, and addiction to watching Television and other viewing gadgets. Generally, the study concludes that public library helps to promote the reading culture among library users despite the factors that hinder effective reading culture. Thus, the study calls for library management to establish several branches of public libraries or mobile public libraries so that library users will not need to travel a long distance to find a public library. Moreover, the public library should make sure that it equips with reading materials that have titles that relate to users’ needs but also with the language that is familiar to most of its users. Furthermore, reading materials that are received as gifts or donations should be aligned with the collection management policy.