| Competition: | NB I |
| Season: | 1966 (16.) |
| Winners: | Ferencvárosi TC (1st title) |
| Continentalcup1: | European Cup |
| Continentalcup1 Qualifiers: | Ferencvárosi TC |
| League Topscorer: | Klára Horváth |
| Prevseason: | 1965 |
| Nextseason: | 1967 |
The 1966 Nemzeti Bajnokság I is the 16th season of the Nemzeti Bajnokság I, Hungary's premier Handball league.
| Team | M | W | D | L | G+ | G− | P | Notes | |
|---|---|---|---|---|---|---|---|---|---|
| 1. | Ferencvárosi TC | 26 | 23 | 1 | 2 | 209 | 69 | 47 | 1967-68 European Cup round 1 |
| 2. | Bp. Spartacus | 26 | 20 | 2 | 4 | 245 | 141 | 42 | |
| 3. | Testnevelési Főiskola SE | 26 | 20 | 1 | 5 | 223 | 153 | 41 | |
| 4. | Pécsi Bányász | 26 | 14 | 2 | 10 | 189 | 152 | 30 | |
| 5. | Goldberger SE | 26 | 14 | 2 | 10 | 180 | 158 | 30 | |
| 6. | Ózdi Kohász | 26 | 14 | 2 | 10 | 202 | 183 | 30 | |
| 7. | Győri Textiles | 26 | 13 | 3 | 10 | 171 | 170 | 29 | |
| 8. | Csepel SC | 26 | 13 | 1 | 12 | 182 | 160 | 27 | |
| 9. | Bp. Gumiipari SC | 26 | 9 | 5 | 12 | 132 | 159 | 23 | |
| 10. | Bp. Postás | 26 | 7 | 5 | 14 | 157 | 166 | 19 | |
| 11. | Veszprémi Vasas | 26 | 7 | 4 | 15 | 138 | 187 | 18 | |
| 12. | VM Közért | 26 | 7 | 2 | 17 | 151 | 232 | 16 | Relegated to Nemzeti Bajnokság II |
| 13. | Győri Vasas ETO | 26 | 2 | 3 | 21 | 95 | 184 | 7 | |
| 14. | Makói VSE | 26 | 2 | 1 | 23 | 119 | 279 | 5 | |