South Solitary Island Light is an active lighthouse on South Solitary Island, an island within the Solitary Islands Marine Park, about 15 kilometres (9.3 mi) northeast of Coffs Harbour, New South Wales, Australia. The lighthouse is located at the summit of the island. It is considered the most isolated lighthouse on the New South Wales coast. It was first in New South Wales to use kerosene over colza oil, and the last to do so before converting to electric power.