The article examines the essence, experience of creation and activity of modern corporate libraries amid the development of knowledge management systems at large Russian companies. Special attention is paid to the definition of the substantive, functional and structural components of the concept of corporate library. The main functions in the context of the organization's personnel policy, management entities, work formats and methods of promoting corporate libraries, as well as the thematic focus and ways of forming library collections are identified. In order to assess the effectiveness of libraries as corporate knowledge bases, the authors provide metrics reflecting the level of user satisfaction, detailed statistics on readers and content consumption. In conclusion, the authors discuss the immediate prospects for the development of corporate libraries, highlighting three key vectors: the transformation of the library into a corporate knowledge management center; the transition to multiformat, microformat and omnichannel library information resources; and the further use of information technology, artificial intelligence systems in all processes of working with information and knowledge at the organizational level.