Orroroo is a town in the Flinders Ranges region of South Australia. At the 2011 census, Orroroo shared a population of 540 with adjoining localities. The Wilmington-Ucolta Road passes through here, intersecting with the RM Williams Way which leads to the Birdsville and Oodnadatta Tracks. The Peterborough–Quorn railway line extended from Peterborough to Orroroo also in 1881 and Quorn in 1882, connecting with the new Central Australia Railway from Port Augusta. These railways have now been abandoned. Orroroo is situated near Goyder's Line, a line drawn up in 1865 by Surveyor General Goyder which he believed indicated the edge of the area suitable for agriculture.