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.
| Club | GP | W | T | L | GF–GA | Pts | ||
|---|---|---|---|---|---|---|---|---|
| 1. | 36 | 25 | 3 | 8 | 197:118 | 53 | ||
| 2. | 36 | 24 | 4 | 8 | 224:133 | 52 | ||
| 3. | 36 | 23 | 2 | 11 | 179:136 | 48 | ||
| 4. | 36 | 21 | 4 | 11 | 204:123 | 46 | ||
| 5. | 36 | 12 | 8 | 16 | 158:173 | 32 | ||
| 6. | 36 | 12 | 5 | 19 | 161:179 | 29 | ||
| 7. | 36 | 12 | 5 | 19 | 91:125 | 29 | ||
| 8. | 36 | 14 | 0 | 22 | 126:207 | 28 | ||
| 9. | 36 | 11 | 3 | 22 | 146:197 | 25 | ||
| 10. | 36 | 7 | 4 | 25 | 114:209 | 18 |