1989–90 Országos Bajnokság I (men's water polo)
1989–90 Országos Bajnokság I was the 84th water polo championship in Hungary.
First stage
Pld - Played; W - Won; L - Lost; PF - Points for; PA - Points against; Diff - Difference; Pts - Points.
Championship Playoff
Final standing
| Qualified for the 1990–91 LEN Champions League | |
| Qualified for the 1990–91 LEN Cup Winners' Cup |
| Rank | Team |
| Ferencvárosi TC-Törley | |
| Vasas SC | |
| Szeged SC | |
| 4 | Tungsram SC |
| 5 | Újpesti Dózsa |
| 6 | Szentesi Vízmű |
| 7 | Szolnoki Vízügy |
| 8 | Bp. Spartacus |
| 9 | Eger SE |
| 10 | BVSC |
| 11 | OSC |
| 12 | Tatabányai Bányász |
| 1989–90 OB I Champions |
| Ferencvárosi TC-Törley 20th Title |