| Competition: | OB I |
| Season: | 1956 |
| Winners: | Ferencváros |
| Prevseason: | 1955 |
| Nextseason: | 1957 |
1956 Országos Bajnokság I (men's water polo) was the 50th water polo championship in Hungary. There were ten teams who played one-round match for the title.
| Team | M | W | D | L | G+ | G− | P | |
|---|---|---|---|---|---|---|---|---|
| 1. | Bp. Kinizsi (Ferencváros) | 9 | 7 | 1 | 1 | 48 | 16 | 15 |
| 2. | Bp. Dózsa (Újpest) | 9 | 7 | 1 | 1 | 48 | 18 | 15 |
| 3. | Bp. Vasas | 9 | 6 | 2 | 1 | 39 | 21 | 14 |
| 4. | Bp. Honvéd | 9 | 4 | 5 | 0 | 41 | 19 | 13 |
| 5. | Szolnoki Dózsa | 9 | 3 | 3 | 3 | 29 | 22 | 9 |
| 6. | Bp. Vörös Lobogó (MTK) | 9 | 2 | 4 | 3 | 26 | 28 | 8 |
| 7. | Bp. Törekvés (BVSC) | 9 | 3 | 1 | 5 | 40 | 38 | 7 |
| 8. | Bp. Spartacus | 9 | 3 | 0 | 6 | 27 | 42 | 6 |
| 9. | Vasas Gheorghiu Dej Hajógyár | 9 | 1 | 1 | 7 | 20 | 61 | 3 |
| 10. | Egri Bástya | 9 | 0 | 0 | 9 | 9 | 62 | 0 |
* M: Matches W: Win D: Drawn L: Lost G+: Goals earned G−: Goals got P: Point