Yallunda Flat is a locality situated on the Eyre Peninsula in the Australian state of South Australia. It is positioned approximately 257 kilometres west of the state capital, Adelaide. Both the name and the official boundaries of the locality were established in 1998.
The name Yallunda Flat is derived from a local landform of the same name. The area encompasses two places gazetted as unbounded localities: Kapinka and Urrano. Administratively, it falls within the federal division of Grey, the state electoral district of Flinders, and the local government area of the District Council of Tumby Bay.