Even though disinformation is not a new problem in Japanese society, threat perception has been low in Japan, and until recently, few measures have been taken to combat disinformation. However, this situation has finally changed, and a number of actors in Japan have begun to take measures against disinformation. This chapter reviews the history of disinformation that has spread through various media in Japan, focusing on a number of examples, and discusses the latest efforts to combat disinformation by the government, media, private sector, and civil society organizations, and the challenges they face.