State Route 105 was a proposed route in the Great Southern region on Western Australia, linking the city of Albany with the state' wheatbelt region.
Passing through the Stirling Range, the route would have serviced several small towns, residential, commercial and rural properties. It also provides access to a couple of national parks.
The route did receive some signs with State Route 105 on them, but the route was never fully implemented. The route has appeared on some new guide signs along the length of the route in Great Southern Region, including as recently as 2023. But it has never appeared on maps and has never been comprehensively signed. And it has never been shown on the official list of Western Australian State Routes. 2