Blue Knob is a locality in the Northern Rivers region of New South Wales, Australia which sits within the City of Lismore local government area. It is approximately from the regional centre of Lismore and to the nearest town of Nimbin.
The traditional owners of this area are the Widjabul people of the Bundjalung nation.
It is nearby to Lillian Rock, next to Blue Knob Mountain, which is a sacred landmark to the Bundjalung people.
In , Blue Knob had a population of 210 people.