1977–78 I-Divisioona season

The 1977–78 I-Divisioona season was the fourth season of the I-Divisioona, the second level of Finnish ice hockey. 10 teams participated in the league, and SaiPa Lapeenranta won the championship. SaiPa Lappeenranta and FoPS Forssa qualified for the promotion/relegation round of the SM-liiga.