Shigetada Nishijima (西嶋重忠) (born 4 June 1911) is a Japanese scholar, former spy and lobbyist. He was active in Indonesia before, during and after the Japanese occupation of Indonesia, and became a major figure on the Japanese side of the Indonesian National Revolution. Between the 1950s and the 1960s, he was a lobbyist and an intermediary, linking Japanese and Indonesian interests. Later on, he became a scholar of and published memoirs of his time in Indonesia.