Mullumbimby is a town in the Northern Rivers region of New South Wales, Australia in Byron Shire. It lies at the foot of Mount Chincogan in the Brunswick Valley about 10 kilometres (6 mi) from the sea. It is a gateway to a number of hinterland areas of great beauty.
Mullumbimby is about 4 kilometres (2 mi) west of the Pacific Highway, where the Sydney via Lismore to Murwillumbah railway line crosses the Brunswick River. The line opened in 1894 and was closed in 2004 because of an argument over funding between Federal and State politicians, and despite strong community resistance across the region. Closure of the railway line between Murwillumbah and Casino has reduced transport options in the region. Mullumbimby is close to the towns of Ocean Shores and Brunswick Heads and a rainforest pocket called Wilsons Creek.
The Mullumbimby town and surrounding area became a centre of alternative or counter culture in the 1970s and 1980s, alongside existing mainstream society, as did nearby Byron Bay and remains so today.
Mullumbimby was a separate municipality from 1908 until 1980 when it was forced to amalgamate with the Byron Shire Council. The Byron Shire Council offices were relocated to Mullumbimby in the 1990s.
A static inverter plant of HVDC Directlink is located near Mullumbimby. This inverter plant was previously the site of a Hydroelectric power scheme generating electricity, that powered Mullumbimby and Byron Bay from 1926, using water from a Weir in near by Wilsons Creek (New South Wales.) The Hydroelectric sceme was designed by William Corin(1867 - 1929).