Hallett is a small town in Mid North region of South Australia, situated on the Barrier Highway 32 kilometres (20 mi) north of Burra and 38 kilometres (24 mi) south-east of Jamestown, Hallett lies close to Goyder's Line, plotted in the nineteenth century by George Goyder, separating the land suitable for cropping from the land suitable for grazing.

The town was named for pioneering pastoralist and politician John Hallett, and laid out on his property "Willogoleechee".

Once a railhead for the local farming community, the town today features a General Store with fuel supply and the Wildongoleechie Hotel, which dates from 1868.

The historic Cappeedee Homestead and Woolshed is listed on the South Australian Heritage Register.

Sir Hubert Wilkins birthplace and childhood home, Netfield, now restored as a historic site, is easily accessible from the renowned Mount Dare Driving Circuit between Hallett and Terowie.