The 1999–2000 OB I bajnokság season was the 63rd season of the OB I bajnokság, the top level of ice hockey in Hungary. Seven teams participated in the league, and Dunaferr SE Dunaujvaros won the championship.
| Club | GP | W | T | L | Goals | Pts | ||
|---|---|---|---|---|---|---|---|---|
| 1. | 12 | 10 | 2 | 0 | 108:14 | 22 | ||
| 2. | 12 | 9 | 1 | 2 | 103:35 | 19 | ||
| 3. | 12 | 8 | 3 | 1 | 102:29 | 19 | ||
| 4. | 12 | 6 | 0 | 6 | 52:73 | 12 | ||
| 5. | 12 | 3 | 0 | 9 | 43:85 | 6 | ||
| 6. | 12 | 2 | 0 | 10 | 31:80 | 4 | ||
| 7. | 12 | 1 | 0 | 11 | 30:153 | 2 |
| Club | GP | W | T | L | Goals | Pts | ||
|---|---|---|---|---|---|---|---|---|
| 1. | 12 | 7 | 3 | 2 | 50:31 | 17 | ||
| 2. | 12 | 5 | 2 | 5 | 42:45 | 12 | ||
| 3. | 12 | 1 | 5 | 6 | 41:57 | 7 |
| Club | GP | W | T | L | Goals | Pts | ||
|---|---|---|---|---|---|---|---|---|
| 4. | 12 | 10 | 0 | 2 | 84:36 | 20 | ||
| 5. | 12 | 8 | 0 | 4 | 75:51 | 16 | ||
| 6. | 12 | 3 | 0 | 9 | 46:66 | 6 | ||
| 7. | 12 | 3 | 0 | 9 | 36:88 | 6 |