The purpose of the research was to develop and analyze an ontological knowledge base model for the effective organization of libraries while exploring the potential practical applications of information technology within this field. The ontology-based model enables structured knowledge representation to facilitate easy access to information and efficient search processes for users. The research involved evaluating the advantages of ontological modeling within libraries compared to traditional classification and cataloging methods and selecting suitable software tools for implementing the ontological model. The results of the study could pave the way for the implementation and testing of the ontological model in real-world library settings and the evaluation of its economic efficiency.