The 1980–81 I-Divisioona season was the seventh 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 Koo-Vee qualified for the promotion/relegation round of the SM-liiga.
| Club | GP | W | T | L | GF–GA | Pts | ||
|---|---|---|---|---|---|---|---|---|
| 1. | 36 | 27 | 2 | 7 | 294:128 | 56 | ||
| 2. | 36 | 23 | 1 | 12 | 211:151 | 47 | ||
| 3. | 36 | 18 | 8 | 10 | 172:141 | 44 | ||
| 4. | 36 | 18 | 6 | 12 | 213:158 | 42 | ||
| 5. | 36 | 19 | 3 | 14 | 177:160 | 41 | ||
| 6. | 36 | 12 | 8 | 16 | 141:168 | 32 | ||
| 7. | 36 | 14 | 3 | 19 | 141:184 | 31 | ||
| 8. | 36 | 12 | 1 | 23 | 111:209 | 25 | ||
| 9. | 36 | 11 | 2 | 23 | 127:202 | 24 | ||
| 10. | 36 | 7 | 4 | 25 | 123:209 | 18 |