PurposeLibraries, museums and cultural centers have long served as cultural ambassadors and foreign policy instruments, bridging diplomatic relationships among nation-states and institutions. The purpose of this scoping review is to ascertain and understand the emerging areas of research on libraries, museums and cultural centers in foreign policy and cultural diplomacy within broader research paradigms of international relations, social sciences, education and library and information studies by systematically mapping key concepts and identifying the types of studies and knowledge gaps.Design/methodology/approachUsing the Joanna Briggs Institute’s (JBI) Manual for Evidence Synthesis, relevant peer-reviewed journal articles, books and book chapters that were published over a wide time period in any language from various databases were systematically examined. Two reviewers worked independently to extract the data and reached a consensus regarding the inclusion criteria using the JBI’s data charting template.FindingsIn total, 6,436 citations were screened, and 57 documents were identified as eligible for inclusion. The following sequences were reviewed and explored: study characteristics, theoretical approaches and research themes. The research themes were grouped into broader ones that included goals, actors, strategies and instruments. Finally, the concentration and clusters of ideas and gaps that emerged in the identified studies were investigated, resulting in a discussion of the recommendations and directions for future research.Originality/valueThis first scoping review is a useful tool for investigating the changing and novel roles of libraries, museums and cultural centers in cultural diplomacy and foreign policy. Although substantial work exists on the topic, the potential remains for interdisciplinary research to challenge and extend the current knowledge about cultural diplomacy practices in libraries, museums and cultural centers.