The 1986–87 I-Divisioona season was the 13th season of the I-Divisioona, the second level of Finnish ice hockey. 12 teams participated in the league, and KooKoo won the championship. KooKoo, TuTo Hockey, HPK Hämeenlinna, and JoKP Joensuu qualified for the promotion/relegation round of the SM-liiga.
| Club | GP | W | T | L | GF–GA | Pts | ||
|---|---|---|---|---|---|---|---|---|
| 1. | 44 | 36 | 2 | 6 | 302:137 | 74 | ||
| 2. | 44 | 28 | 1 | 15 | 234:120 | 57 | ||
| 3. | 44 | 27 | 1 | 16 | 223:165 | 55 | ||
| 4. | 44 | 25 | 2 | 17 | 231:190 | 52 | ||
| 5. | 44 | 23 | 5 | 16 | 205:201 | 51 | ||
| 6. | 44 | 23 | 1 | 20 | 200:203 | 47 | ||
| 7. | 44 | 19 | 1 | 24 | 195:237 | 39 | ||
| 8. | 44 | 18 | 3 | 23 | 193:241 | 39 | ||
| 9. | 44 | 17 | 2 | 25 | 221:215 | 36 | ||
| 10. | 44 | 16 | 4 | 24 | 189:236 | 36 | ||
| 11. | 44 | 15 | 1 | 28 | 217:292 | 31 | ||
| 12. | 44 | 4 | 3 | 37 | 131:306 | 11 |