Wanbi is a settlement in South Australia. At the 2006 census, Wanbi had a population of 154.
Wanbi is on the Karoonda Highway and the Loxton railway line. It was passed in 1912 by the Barmera railway line and became the junction where the Moorook railway line branched off in 1925. The contraction of railways in South Australia in the 1980s meant that both of these broad gauge lines closed, except for the branch towards Loxton which was shortened to Tookayerta and converted to standard gauge. That line also ceased to be used from July 2015.