Leasingham (33°58′S 138°39′E) is the name of a hamlet on the southern edge of the Clare Valley, in the Mid North of South Australia. It is approximately 117 kilometres from the state's capital, Adelaide and 17 kilometres south of the town of Clare.
Although the surrounding country is elevated, the township is located in lower country at the intersection of Main North Road and the connecting roads to Mintaro (to the East) and Hoyleton (to the West). Leasingham is bisected by the Eyre Creek as it makes its way to the Wakefield River. The Riesling Trail is on the western fringe of the township, following the former railway route between Auburn and Clare.