Nantmor is a hamlet which lies about 1½ miles to the south of the village of Beddgelert in Gwynedd, North Wales.

The current spelling of the name Nantmor is more modern - most old documents from the 16th to the 18th century record the name as Nanmor, although the Ordnance Survey map of 1558 records the name "Nant-y-mor."

It lies close to the scenic Aberglaslyn Pass, and formerly had a halt on the original Welsh Highland Railway (which closed in 1937, but which is currently being rebuilt).

A car park run by the National Trust is a popular starting point for walks up Cwm Bychan or along the Aberglaslyn.

The village is perhaps most famous for being the home of Dafydd Nanmor, a renowned 15th century bard (died c1490), who took his name from the hamlet, as did Rhys Nanmor after him. Dafydd Nanmor himself was possibly a bardic student of Rhys Goch, who lived at neighbouring Hafod Garegog.

Carneddi, a nearby hill farm, was the home of Ruth Janette Ruck, who published a trilogy of books about her experiences in the 1950s, '60s and '70s, namely "Place of Stones", "Hill Farm Story" and "Along Came a Llama". In 1980 she featured in the HTV "About Britain" series in an episode called "The Lady and the Llama", which featured a year on the farm.