| Dduallt | |
| Elevation M: | 662 |
| Prominence M: | 138 |
| Range: | Snowdonia |
| Listing: | Hewitt, Nuttall, HuMP |
| Translation: | Black hill |
| Language: | Welsh |
| Pronunciation: | in Welsh ˈðɨæɬt/ |
| Location: | Gwynedd, Wales |
| Map: | Wales Gwynedd |
| Grid Ref Uk: | SH810273 |
| Easiest Route: | From Rhydymain |
| Fetchwikidata: | ALL |
Dduallt (English: Black hill) (pronounced in Welsh pronounced as /ðɨ.æɬt/) is a mountain in central Snowdonia, north Wales. It is the sister peak of Rhobell Fawr.
It lies north of the A494 between Dolgellau and Llanuwchllyn. Its eastern slopes are the source of the Afon Dyfrdwy (River Dee).[1]
It is normally climbed from the SW (often with Rhobell Fawr) as there are large boggy areas to the N and E and very steep E face.