Wnion Halt (Pron: Oon-y'n) in Gwynedd, Wales, was on the Ruabon to Barmouth line. The station, which was situated in a narrow part of the Wnion Valley, is next to Pont Llanrhaiadr. It was sited on the north side of the line against a road's retaining wall. The halt consisted of a short timber-edged platform with a wooden shelter and nameboard. It had passing loop or freight activity. Only rusted platform supports remain. The halt's entrance gate is now part of a driveway to a private residence.

Preceding station		Disused railways		Following station
Drws-y-Nant		Great Western Railway Ruabon Barmouth Line		Bont Newydd

• Mitchell, Vic; Smith, Keith (2010). Ruabon to Barmouth. West Sussex: Middleton Press. fig. 88. ISBN 9781906008840. OCLC 651922152.

• Wnion Halt on navigable 1946 O.S. map

52°46′21″N 3°47′15″W / 52.7725°N 3.7875°W / 52.7725; -3.7875