| Competition: | OB I |
| Season: | 1984 |
| Winners: | Vasas (12th title) |
| Relegated: | Hódmezővásárhelyi VSE |
| Prevseason: | 1983 |
| Nextseason: | 1984–85 |
1984 Országos Bajnokság I (men's water polo) was the 78th water polo championship in Hungary.
| Team | M | W | D | L | G+ | G− | P | |
|---|---|---|---|---|---|---|---|---|
| 1. | Vasas SC | 12 | 11 | 1 | 0 | 167 | 107 | 23 |
| 2. | Bp. Spartacus | 12 | 6 | 1 | 5 | 116 | 122 | 13 |
| 3. | Eger SE | 12 | 4 | 4 | 4 | 107 | 112 | 12 |
| 4. | Tungsram SC | 12 | 5 | 1 | 6 | 109 | 125 | 11 |
| 5. | Szentesi Vízmű | 12 | 3 | 4 | 5 | 112 | 114 | 10 |
| 6. | Bp. Honvéd | 12 | 3 | 2 | 7 | 108 | 122 | 8 |
| 7. | Medicor-OSC | 12 | 3 | 1 | 8 | 102 | 119 | 7 |
| Team | M | W | D | L | G+ | G− | P | |
|---|---|---|---|---|---|---|---|---|
| 1. | BVSC | 12 | 11 | 0 | 1 | 149 | 94 | 22 |
| 2. | Ferencvárosi TC | 12 | 9 | 0 | 3 | 123 | 106 | 18 |
| 3. | Szolnoki Vízügy | 12 | 6 | 1 | 5 | 118 | 102 | 13 |
| 4. | Újpesti Dózsa | 12 | 5 | 2 | 5 | 110 | 102 | 11 |
| 5. | Tatabányai Bányász | 12 | 6 | 0 | 6 | 124 | 122 | 12 |
| 6. | Szegedi EOL AK | 12 | 2 | 1 | 9 | 115 | 131 | 5 |
| 7. | Hódmezővásárhelyi VSE | 12 | 1 | 0 | 11 | 98 | 181 | 2 |
| Championship Playoff | ||
| Relegation Playoff |
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