The 1978–79 I-Divisioona season was the fifth 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 | 4 | 7 | 218:121 | 54 | ||
| 2. | 36 | 21 | 6 | 9 | 212:164 | 48 | ||
| 3. | 36 | 19 | 7 | 10 | 160:141 | 45 | ||
| 4. | 36 | 19 | 6 | 11 | 183:161 | 44 | ||
| 5. | 36 | 17 | 4 | 15 | 163:158 | 38 | ||
| 6. | 36 | 14 | 4 | 18 | 121:126 | 32 | ||
| 7. | 36 | 11 | 9 | 16 | 140:181 | 31 | ||
| 8. | 36 | 12 | 4 | 20 | 151:185 | 28 | ||
| 9. | 36 | 9 | 6 | 21 | 131:172 | 24 | ||
| 10. | 36 | 5 | 6 | 25 | 127:197 | 16 |