The Oodnadatta Track is an unpaved outback track in the north of the Australian state of South Australia. It connects the Birdsville Track in Marree via Oodnadatta with the Stuart Highway in Marla. It runs a few kilometres along Lake Eyre South.
This track is a traditional trade route of the indigenous tribes, along which there are a number of springs fed by the Great Artesian Basin. The best surviving example of this is Mound Springs near Coward Springs. The explorer John McDouall Stuart followed the course of the trade route on his third expedition to Darwin in 1859. Later, this route was chosen as the original route of the Ghan for the Overland Telegraph Line (OTL) and the Central Australian Railway because of the availability of water. Even today, many remains of railway tracks and telegraph stations can be found along the route, one of the best preserved being the ruins at Coward Springs Siding.