The 1939–40 OB I bajnokság season was the fourth season of the OB I bajnokság, the top level of ice hockey in Hungary. Three teams participated in the league, and BKE Budapest won the championship.
| Club | GP | W | T | L | Goals | Pts | ||
|---|---|---|---|---|---|---|---|---|
| 1. | 4 | 3 | 0 | 1 | 18:5 | 6 | ||
| 2. | 4 | 3 | 0 | 1 | 9:6 | 6 | ||
| 3. | 4 | 0 | 0 | 4 | 0:16 | 0 |