In thesis, I have analyzed recorded knowledge and research related to the situation in Italian and Croatian school libraries, and I followed the IFLA guidelines which are instructions for the effective work of school librarians and libraries. A school library is an educational, information and cultural center that operates within the school and provides its users with a space for learning from all the areas mentioned above. In addition to being a meeting place for new content, activities and information, it's a collaboration, reflection and operating space. Presented problem through the research is related to the place that is impractical and unusable due to the limitation and lack of space for users to stay in the library while on the other hand there are well-equipped libraries. There's also disproportion in financing and covering the cost of new libraries establishment, new books purchase and space renovation. Libraries are forced to organize projects and actions in order to maintain their primary role and quality at a high level. The professional development of librarians and their competences also influence the efficient library development. The pandemic caused by the COVID-19 disease has brought changes to all areas of human life, including the educational system and the library. The influence of the library during the pandemic in Italy and Croatia and its continued provision of services through virtual form is analyzed in this paper. In addition to the services provided during the pandemic, activities provided in physical form are also analyzed.