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.

This Anglesey location article is a stub.