The 1966 season of the Japan Soccer League.
| Competition: | Japan Soccer League |
| Season: | 1966 |
| Winners: | Toyo Industries 2nd title |
| Relegated: | Nagoya Mutual Bank |
| League Topscorer: | Aritatsu Ogi (14 goals) |
| Matches: | 56 |
| Total Goals: | 183 |
| Average Attendance: | 5,683 |
| Prevseason: | 1965 |
| Nextseason: | 1967 |
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.
| JSL | 1st leg | 2nd leg | Senior Cup | |
|---|---|---|---|---|
| Nagoya Mutual Bank (JSL 7th Place) | 2-3 | 1-2 | Nippon Kokan (cup runner-up) | |
| Yanmar Diesel (JSL 8th Place) | 1-0 | 1-1 | Urawa SC (cup winner) |
| Position | Footballer | Club | Nationality | |
|---|---|---|---|---|
| GK | Kenzo Yokoyama (1) | Mitsubishi Motors | ||
| DF | Hiroshi Katayama (1) | Mitsubishi Motors | ||
| DF | Masakatsu Miyamoto (1) | Furukawa Electric | ||
| DF | Kazuo Imanishi (1) | Toyo Industries | ||
| MF | Aritatsu Ogi (1) | Toyo Industries | ||
| MF | Hisao Kami (1) | Yawata Steel | ||
| MF | Ryuichi Sugiyama (1) | Mitsubishi Motors | ||
| MF | Teruki Miyamoto (1) | Yawata Steel | ||
| FW | Shigeo Yaegashi (1) | Furukawa Electric | ||
| FW | Takayuki Kuwata (1) | Toyo Industries | ||
| FW | Ikuo Matsumoto (1) | Toyo Industries |