Boya is a locality on the Darling Scarp, in the Shire of Mundaring, Western Australia; it is on the south side of Greenmount Hill, and just west of Darlington.

The name of Boya is a local Noongar word meaning "stone" or "rock", and was imposed by government officials in the early twentieth century.

Quarries

It was crucial as a site of quarries. The Mountain Quarry and the Government Quarry were both important blue stone quarries in their time.

The harbour and moles at Fremantle were built using stone from the Government quarry.

The Government Quarry (on the south eastern part of the locality) was variously named during its time of operation as Mr O'Connor's quarry, the Fremantle Harbour Works Darlington Quarry, the Public Works Quarry, the Government Quarry, and, currently, as Hudman Road Quarry.

Being at the edge of the Greenmount National Park and the Hudman Road Quarry, Boya has been subject to serious threatening bushfires spreading from these locations in recent years.

Railway

In the history of the early Eastern Railway, which passed through Boya, Boya was the location of "Cape Horn", a notorious curve at the 22-mile (35 km) mark, where runaway trains derailed a number of times.

The community has a rich architectural variety of houses due to the challenge of steep and rocky blocks.

Transport

Bus

•    322 Midland Station to Glen Forrest – serves Scott Street, Marriott Road and Coulston Road