Japan–Singapore relations or Singapore–Japan relations ( ) refers to the bilateral relations between Japan and Singapore, two highly developed Asian countries which share historical, economic, and political ties. While the two countries first established bilateral relations in 1966, some of the earliest relations date back from before the 15th century during the Muromachi period as well as the Ryukyu Kingdom. This continued for centuries until the most notable interaction with Japan's invasion of Singapore during World War II. The invasion led to a takeover of the country, after which Japan occupied Singapore for approximately four years before withdrawing following their loss in the war.