Dolmelynllyn Estate is an area of farmland, woodland and parkland near the village of Ganllwyd in southern Gwynedd, Wales.

The Dolmelynllyn Estate is approximately 5 miles (8.0 km) north of Dolgellau, Gwynedd, in the southern area of the Snowdonia National Park.

It is over 500 hectares (1,200 acres) in extent and includes landscapes that vary from river terraces to high moorland, as well as boulder-strewn woodland.

[6] He created a ferme ornée (ornamental farm) there, where he entertained friends such as Thomas Love Peacock.

[10][11] The Coed Ganllwyd National Nature Reserve (NNR) lies within the estate and covers 183.77 hectares.

[17][18] The estate also has a population of the epiphytic lichen, Agonimia octospora, which rarely occurs outside the New Forest.

[18] The estate has successfully used conservation grazing by Highland cattle to restore and manage the woodland.

[19] Its woods supplied green oak to support the conservation of Egryn, a medieval farmhouse also owned by the Trust.

[21] In 2019 pine martens were recorded on the estate for the first time; they were lured there from territories nearby with jam and eggs.

[22][23] In 2021 The Guardian named the estate as one of the United Kingdom's top ten places for a spring walk.

[8] The estate also includes Nant Las – a nineteenth-century observatory rented out by the National Trust as a holiday cottage.

[28] The estate also included a water-powered corn mill, potentially built by the Vaughan family, which was later converted to a sawmill and turning-mill.

[29] Eighteen sites of potential prehistoric date occur at scattered locations across the estate.

They include a wide range of monument types: hut circles, cairns, cists, enclosures, platforms and a possible chambered tomb are all represented.