The 1999–2000 I-Divisioona season was the 26th and final season of the I-Divisioona, the second level of Finnish ice hockey. The second-level Finnish league became the Mestis for the 2000–01 season. 12 teams participated in the league, and Kärpät Oulu, Vaasan Sport, and Diskos Jyväskylä qualified for the promotion/relegation round of the SM-liiga.
| Club | GP | W | T | L | GF–GA | Pts | ||
|---|---|---|---|---|---|---|---|---|
| 1. | 48 | 42 | 3 | 3 | 285:91 | 87 | ||
| 2. | 48 | 31 | 5 | 12 | 190:116 | 67 | ||
| 3. | 48 | 24 | 7 | 17 | 178:167 | 55 | ||
| 4. | 48 | 26 | 3 | 19 | 152:151 | 55 | ||
| 5. | 48 | 23 | 6 | 19 | 166:153 | 52 | ||
| 6. | 48 | 22 | 3 | 23 | 155:175 | 47 | ||
| 7. | 48 | 19 | 4 | 25 | 155:190 | 42 | ||
| 8. | 48 | 19 | 2 | 27 | 144:169 | 40 | ||
| 9. | 48 | 19 | 1 | 28 | 144:192 | 39 | ||
| 10. | 48 | 18 | 1 | 29 | 134:177 | 37 | ||
| 11. | 48 | 17 | 2 | 29 | 154:185 | 36 | ||
| 12. | 48 | 8 | 3 | 37 | 134:225 | 19 |