Endocrine Journal is a monthly peer-reviewed medical journal covering endocrinology published by The Japan Endocrine Society. It was established in 1925 as Naibunpigaku Zasshi and renamed Nihon Naibunpigaku-kai Zasshi in 1927. In 1954 it was re-started as an English journal, entitled Endocrinologia Japonica and obtained its current title in 1993. The editor-in-chief is Itaru Kojima (Gunma University).