Based on that the purpose of professionalization in librarianship is to achieve social recognition of its specialty, we discuss about theoretical background for the professionalization in librarianship in Korea. Some characteristics from the previous discussions are identified, such as functionalism, altruism in service, and individualism. Also, we identify organization-centered characteristic as an inherent one in librarianship. Based on the characteristics identified, we discuss about some supportive concepts, such as advanced or complex knowledge, service, organization-centered characteristic, and market, and their interrelationships. We hope such concepts would encourage further discussions on this topic for the professionalization.