| Competition: | OB I |
| Season: | 1986-87 |
| Winners: | BVSC |
| Continentalcup1: | European Cup |
| Continentalcup1 Qualifiers: | BVSC |
| Continentalcup2: | Cup Winners' Cup |
| Prevseason: | 1985-86 |
| Nextseason: | 1987-88 |
1986–87 Országos Bajnokság I (men's water polo) was the 81st water polo championship in Hungary. Fourteen teams played each other twice for the title.
| Team | M | W | D | L | G+ | G− | P | Notes | |
|---|---|---|---|---|---|---|---|---|---|
| 1. | BVSC | 26 | 19 | 3 | 4 | 268 | 219 | 41 | 1987-88 European Cup quarter final |
| 2. | Szolnoki Vízügy | 26 | 18 | 3 | 5 | 248 | 201 | 39 | |
| 3. | Bp. Spartacus | 26 | 17 | 2 | 7 | 249 | 216 | 36 | |
| 4. | Tungsram SC | 26 | 16 | 3 | 7 | 256 | 216 | 35 | |
| 5. | Szeged SC | 26 | 14 | 6 | 6 | 242 | 229 | 34 | |
| 6. | Vasas SC | 26 | 13 | 2 | 11 | 289 | 250 | 28 | |
| 7. | Eger SE | 26 | 11 | 5 | 10 | 232 | 245 | 27 | |
| 8. | Tatabányai Bányász | 26 | 11 | 5 | 10 | 261 | 253 | 27 | |
| 9. | Ferencvárosi TC | 26 | 11 | 4 | 11 | 270 | 257 | 26 | |
| 10. | Újpesti Dózsa | 26 | 11 | 2 | 13 | 254 | 244 | 24 | |
| 11. | Szentesi Vízmű | 26 | 8 | 3 | 15 | 252 | 286 | 19 | |
| 12. | Bp. Honvéd | 26 | 6 | 2 | 18 | 215 | 248 | 14 | |
| 13. | OSC | 26 | 6 | 1 | 19 | 221 | 267 | 13 | |
| 14. | Kecskeméti VSC | 26 | 0 | 1 | 25 | 198 | 324 | 1 |
| County (megye) | No. teams | Teams | ||
|---|---|---|---|---|
| 1 | Budapest | 7 | BVSC, FTC, Honvéd, KSI, OSC, UVSE and Vasas | |
| 2 | Csongrád | 2 | Szeged and Szentes | |
| 3 | Baranya | 1 | PVSK | |
| Hajdú-Bihar | 1 | Debrecen | ||
| Heves | 1 | Eger | ||
| Jász-Nagykun-Szolnok | 1 | Szolnok | ||
| Somogy | 1 | Kaposvár | ||