Thursday Island, colloquially known as TI, or in the native language, Waiben, is an island of the Torres Strait Islands archipelago located approximately 39 kilometres (24 miles) north of Cape York Peninsula in the Torres Strait, Queensland, Australia. It has an area of about 3.5 square kilometres (1.4 square miles). The Muralag peoples are the traditional owners of the land and seas surrounding Thursday Island. The highest point on Thursday Island, standing at 104 metres (341 feet) above sea level, is Milman Hill, a World War II defence facility. At the 2011 census, Thursday Island had a population of 2,610.
Thursday Island is within the Shire of Torres, but is the administrative and commercial centre of the Torres Strait Island Region despite not being part of that local government area.