This article explores the history, legal status, social perception, religious views, and prevalence of polygamy in Japan. Polygamy has been practiced since ancient times but is now illegal and not recognized by the government. It is generally frowned upon by most people in Japanese society today as it goes against traditional values and beliefs about marriage and family life. The majority of religions practiced in Japan do not condone or accept polygamy as a legitimate form of marriage or relationship structure. Although it is relatively rare due to its illegality and social disapproval, there are still some small communities where it may be practiced without much opposition from outsiders or law enforcement agencies.