Graig Trewyddfa (English: Trewyddfa rock) is a hill and small community in Swansea, Wales. It falls under the Morriston electoral ward.
The area is most notable for Morris Castle, an 18th-century block of flats built on the highest peak in the city.
Also in the area is a local park named Llywelyn Park, containing a few acres of open space, a bowling green as well as two playgrounds and a tennis court.