Also, the NDL is focused on collaboration among libraries as well as international cooperation; it exchanges publications internationally, provides international lending, copying and reference services along with training for foreign librarians who deal with Japanese-language books as part of international cooperation.
また、図書館間協力や国際協力にも力を入れており、国際協力では資料の国際交換、資料の貸出・複写・レファレンス、日本語図書を扱う外国人司書の研修などを行なっている。