Oodnadatta, in the Australian state of South Australia, is a small town surrounded by an area of 7,800 square kilometres (3,000 sq mi) with cattle stations in arid pastoral rangelands close to the Simpson Desert, 1,011 km (628 mi) north of Adelaide and 112 m above sea level. It can be reached by an unsealed road from Coober Pedy or via the unsealed Oodnadatta Track from Marree to Marla or from the north via Finke, Northern Territory ("Old Ghan Heritage Trail"). The name is derived from Arrernte utnadata, meaning "mulga blossom".
The population was 229 in 1976 and decreased to 160 in 1986. The 2006 census reported a population of 277 (150 male, 127 female, including 103 indigenous Australians).