Dinas is a large hamlet near Bontnewydd, Caernarfon, in Gwynedd, north-west Wales.

The hamlet developed with the opening of the turnpike Toll roads from Caernarfon first to Pwllheli in 1805, then to Porthmadog in 1810.

Two coaching inns were built to serve the roads, Y Mount, which is now an Indian restaurant and Tafarn Hen, which is now a private residence.

The present Dinas railway station, on the site of the Dinas Junction, was reopened in 1997 as a base for rebuilding the Welsh Highland Railway from Caernarfon to Porthmadog.

It is a visitor attraction and local passenger facility that also links Dinas to Waunfawr, Beddgelert, Pont Croesor and beyond.