| Road Name: | Muir Highway |
| State: | WA |
| Type: | highway |
| Length: | 161 |
| Route: | State Route 102 |
| Direction A: | West |
| End A: | South Western Highway (National Route 1), Manjimup, Western Australia |
| Direction B: | East |
| End B: | Albany Highway (State Route 30), Mount Barker, Western Australia |
| Through: | Lake Muir, |
Muir Highway,[1] also called Muirs Highway, is a Western Australian highway linking Manjimup and Mount Barker, which is on the Albany Highway. It is signed as State Route 102[2] and is long. It provides a shorter distance between the cities of Bunbury and Albany. It is a lowly populated highway passing mostly through karri and jarrah with occasional areas of farmland.
One village, Rocky Gully lies on the highway, although it also passes through the localities of Dingup, Nyamup, Lake Muir, Strachan and Murtinup.
It is primarily used as a freight route for plantation timber trucks and interstate long vehicles servicing the horticultural areas of the South West. The road is a two way, single carriageway bitumen surfaced highway.[3] Muir Highway was named after brothers Thomas and John Muir, the first European settlers in the Warren district, who settled at Deeside in 1852 and built a rush hut there in 1856.[4]