1965–66 Northern Rugby Football League season

1965–66 Rugby Football League season
LeagueNorthern 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.