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.

[5] 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.

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.

[6][7][8][9] The community has a rich architectural variety of houses due to the challenge of steep and rocky blocks.