Introduction. This study aims to examine the most prominent libraries in the classical Islamic period based on Islamic history. Islam in its golden age was once the most advanced civilization in the world. Data Collection Methods. This type of research is descriptive qualitative where data is collected through observation, interviews and documentation. Data Analysis. The theory used uses the principle of the library (Library low) based on Ranganathan. Data analysis in this study used the Miles & Huberman model, namely by reducing data, presenting data, and drawing conclusions / verification. Results and Discussion. The most prominent library revitalization manuscripts during the classical Islamic period were the Bayt al-Hikmah Library in Baghdad, the University Library of Cordoba, and the Dar al-Hikmah Library in Cairo. The three universities received enormous support from the government in carrying out their roles and functions in developing science at that time. Conclusion. The result of this research is that the development of Islamic libraries has roles and functions that can be adapted in universities, including study and research centers, scientific meeting centers and foreign book translation centers.