| Llys Rhosyr | |
|---|---|
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| 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 |
  Location of Llys Rhosyr in Anglesey | |
Llys Rhosyr, also known as "Cae Llys", is an archaeological site near Newborough in Anglesey; the ruins of a pre-Edwardian commotal court.