| Competition: | OB I |
| Season: | 1973 |
| Winners: | Orvosegyetem |
| Prevseason: | 1972 |
| Nextseason: | 1974 |
1973 Országos Bajnokság I (men's water polo) was the 67th 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 | 12 | 6 | 0 | 100 | 66 | 30 |
| 2. | Újpesti Dózsa | 18 | 8 | 7 | 3 | 81 | 66 | 23 |
| 3. | Ferencvárosi TC | 18 | 9 | 4 | 5 | 75 | 70 | 22 |
| 4. | Egri Dózsa | 18 | 7 | 5 | 6 | 106 | 91 | 19 |
| 5. | Vasas SC | 18 | 7 | 5 | 6 | 85 | 76 | 19 |
| 6. | BVSC | 18 | 8 | 2 | 8 | 81 | 82 | 18 |
| 7. | Vasas Izzó | 18 | 5 | 7 | 6 | 75 | 79 | 17 |
| 8. | Bp. Spartacus | 18 | 5 | 7 | 6 | 64 | 65 | 17 |
| 9. | Bp. Honvéd | 18 | 4 | 3 | 11 | 66 | 89 | 11 |
| 10. | Szentesi Vízmű | 18 | 1 | 2 | 15 | 68 | 117 | 4 |
* M: Matches W: Win D: Drawn L: Lost G+: Goals earned G−: Goals got P: Point