This study aims to: determine the reality of the library, a description of students' reading interest, and the implementation of library management in increasing students' reading interest in Madrasah Tsanawiyah Negeri Gowa. This type of research is a collaborative action research school (madrasah) using a management approach. This research is located in Madrasah Tsanawiyah Negeri Gowa. Data collection uses two types of data, namely primary data sources through direct observation and observation and secondary data sources from books, journals, and other important documents. The results of this study indicate that the implementation of library management can increase students' reading interest in Madrasah Tsanawiyah Negeri Gowa. This can be seen from the increasing number of library visitors each cycle, namely in cycle 1 as many as 24 people (5.15%), cycle II as many as 69 people (14.81%), and cycle III as many as 151 people (32.40%) of the total number of students as many as 466 people. Based on these calculations, cycle 1 to cycle II has increased by 9.66% while from cycle II to cycle III has increased by 17.59%. Thus the interest of students in Madrasah Tsanawiyah Negeri Gowa has increased. The implication of this research is that the head of the madrasa should provide adequate facilities and infrastructure in the library so that students feel happy and interested in entering the library. Meanwhile, the library must further improve good library management in carrying out work programs prepared by making SOP so that the implementation of each program can run effectively and efficiently.