Llys Rhosyr
| Llys Rhosyr | |
|---|---|
| Type | Royal court | 
| Location | Newborough, Anglesey | 
| Coordinates | 53°09′43″N 4°21′58″W / 53.1619°N 4.3661°W | 
| Governing body | CADW | 
| Official name | Llys Rhosyr | 
| Designated | 20 March 1997 | 
| Reference no. | AN129 | 
Llys Rhosyr, also known as "Cae Llys", is an archaeological site near Newborough in Anglesey; the ruins of a pre-Edwardian commotal court.