List of highways in Western Australia

Highways in Western Australia include both roads that are named as a highway, and roads that have been declared as a highway under the Main Roads Act 1930. The standard of highways range from two-lane roads, common in rural areas, to controlled access, grade separated freeways in Perth.

In legislation, a highway is a type of road controlled and maintained by the state road authority, Main Roads Western Australia. Any road or section of road may be proclaimed a highway by the Governor of Western Australia, on the recommendation of the Commissioner of Main Roads, under Section 13 of the Main Roads Act 1930.^[1] Section 14 of the act allows for the creation of new highways.^[1] Main Roads assigns each highway a name and number, which may vary from the official road names used on road signs and by the general public.^[2] The highway number does not correspond to a road route that may be allocated to the highway, and some highways are not part of a numbered route.^[2]