| Competition: | OB I |
| Season: | 1971 |
| Winners: | Orvosegyetem |
| Prevseason: | 1970 |
| Nextseason: | 1972 |
1971 Országos Bajnokság I (men's water polo) was the 65th water polo championship in Hungary. There were ten teams who played two-round match for the title.
| Team | M | W | D | L | G+ | G− | P | |
|---|---|---|---|---|---|---|---|---|
| 1. | OSC | 18 | 11 | 7 | 0 | 95 | 68 | 29 |
| 2. | Újpesti Dózsa | 18 | 10 | 6 | 2 | 83 | 63 | 26 |
| 3. | Ferencvárosi TC | 18 | 10 | 3 | 5 | 81 | 65 | 23 |
| 4. | Vasas SC | 18 | 5 | 9 | 4 | 78 | 75 | 19 |
| 5. | Bp. Spartacus | 18 | 5 | 8 | 5 | 55 | 56 | 18 |
| 6. | Vasas Izzó | 18 | 6 | 6 | 6 | 77 | 78 | 18 |
| 7. | Bp. Honvéd | 18 | 5 | 6 | 7 | 84 | 83 | 16 |
| 8. | Szolnoki Dózsa | 18 | 5 | 5 | 8 | 75 | 80 | 15 |
| 9. | Egri Dózsa | 18 | 5 | 4 | 9 | 90 | 93 | 14 |
| 10. | Tatabányai Bányász | 18 | 0 | 2 | 16 | 68 | 125 | 2 |
* M: Matches W: Win D: Drawn L: Lost G+: Goals earned G−: Goals got P: Point