Mannahill (gazetted as Manna Hill) is a town and locality in the Australian state of South Australia.

[6] Mannahill was located on the stock route that passed from the Barrier Ranges in New South Wales to the then rail head at Terowie.

[8] Shortly afterwards this article appeared in the Melbourne Argus on 22 October 1886 in the context of the goldrush to the Mannahill goldfields:[9] The journey is principally across saltbush plains and low undulating hills, lightly timbered with mulga and ti-tree.

In shearing time the proprietor does a fair trade, shearers and teamsters from the surrounding stations being the principal customers.

[12] Mannahill has a number of heritage-listed sites, including: Manna Hill is located within the federal division of Grey, the state electoral district of Stuart and the Pastoral Unincorporated Area of South Australia.