1965–66 Northern Rugby Football League season
| 1965–66 Rugby Football League season | |
|---|---|
| League | Northern Rugby Football League |
| Champions | St. Helens |
| League Leaders | St. Helens |
| Top point-scorer(s) | Len Killeen 336 |
| Top try-scorer(s) | Len Killeen 32 Trevor Lake 32 |
The 1965–66 Rugby Football League season was the 71st season of rugby league football. A three-way county championship was also held, with comparative minnows Cumberland against Yorkshire and Lancashire.