Alberta Provincial Highway No. 18 is a highway in Alberta, Canada. It begins northwest of Mayerthorpe at the junction of Highway 43 at the Hamlet of Green Court. It proceeds east 8 km, crossing Highway 22 (which is the terminus for that highway) and reaches Highway 757. At this point it turns north for a few kilometres and bends east again until it crosses Highway 764 and turns north again.The jog in the road skirts Thunder Lake Provincial Park to the north.