Dinorwig, historically spelled as Dinorwic in English, is a village located high above Llyn Padarn, near Llanberis, in Wales. The name is shared with the fort of Dinas Dinorwig, also within the community of Llanddeiniolen, on a foothill 6 kilometres (3.7 mi) from Dinorwig village and 3 kilometres (1.9 mi) from the Menai Strait and also with Port Dinorwic, the anglicised name of Y Felinheli. It lies around a mile from the larger settlement of Deiniolen.

Llanddeiniolen is the name of a community area, in the county of Gwynedd, Wales, and is 124 miles (200 km) from Cardiff and 206 miles (332 km) from London. It comprises the hamlet also called Llanddeiniolen, and the villages of Deiniolen, Bethel, Dinorwig, Rhiwlas, Brynrefail and Penisarwaun. It is the third-largest community by population in Gwynedd, with 5072 people in the 2011 census. Also in the community is the dispersed settlement of Fachwen, located on the north shore of Llyn Padarn. The name derives from the Welsh saint Deiniol, first bishop of Bangor or from his son, saint Deiniolen.