Trawsfynydd Lake Halt was a stopping place on the Great Western Railway's Bala to Ffestiniog Line in Wales. There was also a full station at Trawsfynydd, about 2.5 miles south, and nearer the village of that name. The line closed to passenger services on 2 January 1960 and freight services on 27 January 1961.
The line as far as the former halt was however reopened in 1964 for freight traffic from Blaenau Ffestiniog to the nearby power station. It remained in use until 1998; the line is still in situ but disused.
The halt's platform remains in situ although heavily overgrown.