South Korea’s official development assistance activities emphasize the significant role of education, with increasing attention towards the potential of libraries. Media and information literacy has become imperative for leading a productive life, highlighting the crucial role of libraries in enhancing media and information literacy competencies, particularly in low- and middle-income countries. However, limited research exists on this topic. This study explores how libraries could contribute to improving the media and information literacy competencies of people in low- and middle-income countries, drawing from interviews mainly with South Korean volunteer librarians with experience in low- and middle-income countries using the Delphi method. The challenges in supporting media and information literacy capacity-building in libraries in low- and middle-income countries include a shortage of skilled personnel, limited resources, inadequate understanding of public development assistance and global citizenship, and insufficient publicity. The survey participants emphasized the need for specific qualifications for librarians to effectively contribute to media and information literacy education. They recommended continuous group-based training, incorporating field education and online courses to build media and information literacy competencies.