Statistics of Japan Soccer League for the 1980 season.
Yanmar Diesel won the title for a fourth time.
Nissan, who had saved itself from relegation in the playout the previous season, went down after the bottom place was granted automatic relegation, while Yamaha saved itself by beating Fujitsu in the playout.
Honda was finally promoted on the second attempt after the 1978 debacle.
Cosmo Oil Yokkaichi fell through and went back to the Tokai regional league.