| Country: | Wales |
| Official Name: | Caergeiliog |
| Static Image: | Caergeiliog, Anglesey. - geograph.org.uk - 212815.jpg |
| Static Image Width: | 250px |
| Coordinates: | 53.2747°N -4.5345°W |
| Population: | 355 |
| Unitary Wales: | Anglesey |
| Lieutenancy Wales: | Gwynedd |
| Constituency Westminster: | Ynys Môn |
| Constituency Welsh Assembly: | Ynys Môn |
Caergeiliog is a village in Anglesey, in north-west Wales.[1] It is in the community of Llanfair-yn-Neubwll and has a population of 355.[2] The name derives from Welsh, and is a combination of Caer, meaning 'castle' or 'fort', and ceiliog, meaning 'cockerel'. It is unclear where the second element came from.[3]