This chapter presents a comprehensive directory of professional associations and organizations in the United States that are central to the advancement of educational media, technology, and library and information science. The chapter was developed through a rigorous process that included updating prior editions, online research, and direct engagement with organizational representatives. This compilation offers current information on entities that provide essential resources, networking, publications, conferences, and professional development opportunities. This directory serves as a reference for educators, instructional designers, technologists, librarians, and others seeking to connect with professional bodies dedicated to enhancing education through media and technology.