Wnion Halt (Pron: Oon-y'n) in Gwynedd, Wales, was on the Ruabon to Barmouth line. The station was situated in a narrow part of the Wnion Valley next to Pont Llanrhaiadr and squeezed against a road retaining wall on the north side of the line. There was a short timber-edged platform with a timber shelter and nameboard. There was no passing place or freight activity here. Today rusted platform supports remain and the entrance gate is part of a driveway to a private residence to the east of the halt.