Mullumbimby, locally nicknamed Mullum, is a town in the Byron Shire in the Northern Rivers region of New South Wales, Australia. It promotes itself as "The Biggest Little Town in Australia". The town lies at the foot of Mount Chincogan in the Brunswick Valley about 9 kilometres by road from the coast. At the 2021 census, Mullumbimby and the surrounding area had a population of 3,589 people. It is known for its hippie subculture, and it has been referred to as "Australia's anti-vaxxer capital".
