1999–2000 Országos Bajnokság I (men's water polo)
1999–2000 Országos Bajnokság I was the 94th 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
| Rank | Team |
| Ferencvárosi TC-Thomas Jeans | |
| BVSC-Brendon | |
| Domino-Bp. Honvéd | |
| Vasas SC-Plaket | |
| 5 | Újpesti TE-Santal-Taxi2000 |
| 6 | Kontavill-Szentesi VK |
| 7 | ÚVMK BauSystem-Eger |
| 8 | Csanádi Árpád KSI |
| 9 | Szolnoki VSC |
| 10 | BEAC |
| 1999–00 OB I Champions |
| Ferencvárosi TC-Thomas Jeans 21st Title |