Caldey (Ynys Bŷr)
| Location | SS 14319 95945 / 51.6316, -4.6843 / ticked.typically.wanted |
| Established / Rebuilt / Automated / Closed | 1829 / — / 1927 / — |
| Architect or Builder | Joseph Nelson |
| Height of tower (m) / above sea level (m) / Range (NM) | 16 / 65 / 13 |
| Character | Fl(3) WR 20s |
| Optic | 2nd order fixed catadioptric |
| Owner | Trinity House |
A lighthouse was established on the southern tip of this island to mark the entrance to Carmarthen Bay. It also guides ships up the Bristol Channel, in conjunction with the Lundy North light on the English side. It was the last Trinity House light to be converted from acetylene to electricity in 1997. The island is a popular tourist destination for day trips from Tenby, and it is a pleasant walk from the harbour to the lighthouse.