The history of Islam in Japan is relatively brief in relation to the religion's longstanding presence in other nearby countries, and forms a minority of its historical and current population. Islam is one of the smallest minority faiths in Japan, representing around 0.18% of the total population as of 2019. Despite a small initial population base, immigration from Muslim majority countries has made Islam one of the fastest growing religions in the country in terms of percentage increase, with its followers growing by approximately 110%, from 110,000 in 2010 to 230,000 at the end of 2019, out of the total population of Japan of around 126 million.

Tokyo Mosque, Tōkyō-jāmii (東京ジャーミイ) also known as Tokyo Camii, is a mosque with an adjoining Turkish culture center located in the Ōyama-chō district of Shibuya ward in Tokyo, Japan. It is the largest mosque in Japan.