1966 Japan Soccer League

The 1966 season of the Japan Soccer League.

Promotion/relegation Series
Nagoya Mutual Bank became the first original JSL club to be relegated. In its place, Nippon Kokan from Kawasaki, Kanagawa was promoted and began a long career of league success that was only brought to a halt by the professionalization of the league. Nippon Kokan promoted, Nagoya Mutual Bank relegated.