Establishing of library development strategy is the most important stage in solving the tasks of adapting to the changing environment and increasing demand of users. The purpose of this study is to determine the vectors of strategic development of libraries (public libraries and libraries of scientific and educational institutions). Basing on the results of the analysis, the author identifies nine essential strategic directions and ten vectors, revealing the prospects for the development of libraries, being not only the information repositories and library and information centres, but also working, creative spaces, communication platforms, places for renting equipment, startup sites, etc. The article presents the specific features of public libraries, which are close interaction with the local community, promotion of intercultural and intergenerational dialogue, as well as socialization of the population. Strategies of libraries of scientific and educational institutions much attention pay to the integration of librarians in the research process, creation of analytical products, development of services for scientometric analysis and information support for open scientific research. Libraries strive to serve readers and visitors with the use of modern information technologies, organize spatial environment that ensure comfortable stay, provide resources and services that meet the changing preferences of users, which allows creating positive image of the library and attracting readers.