Miandetta is a locality in the Bogan Shire, within the Orana region, of New South Wales, Australia.

[2] The locality lies on both sides of the Barrier Highway and Cobar railway line, between Nyngan and Hermidale.

The area now known as Miandetta is part of the traditional lands of Wangaaypuwan dialect speakers (also known as Wangaibon) of Ngiyampaa people.

[4] Miandetta was also the name of the North Sydney home of Edmund Barton,[5] although it appears unconnected to the locality.

In the past, there was tree-felling[13] and saw-milling in the area,[14] probably to provide logs and timber for the mines near Cobar.

Most other land in the locality was cleared for agricultural purposes, but the area had no natural sources of water, and was dependent upon rainfall.

[26] A post office was established at Miandetta, and in August 1908, the postmistress was convicted and sentenced to three months imprisonment, for the theft of a letter containing a cheque.