1979–80 I-Divisioona season

The 1979–80 I-Divisioona season was the sixth season of the I-Divisioona, the second level of Finnish ice hockey. 10 teams participated in the league, and HPK Hämeenlinna won the championship. HPK Hämeenlinna and SaiPa Lappeenranta qualified for the promotion/relegation round of the SM-liiga.