Llanllawddog (Welsh pronunciationⓘ) is a community located in Carmarthenshire, south-west Wales.

[2] Llanllawddog is bordered by the Carmarthenshire communities of Llanfihangel-ar-Arth, Llanfihangel Rhos-y-Corn, Llanegwad, Abergwili, Bronwydd, and Llanpumsaint.

The community includes the settlements of Rhydargaeau and Pontarsais, which both lie on the A485 road.

For elections to Carmarthenshire County Council Llanllawddog is part of the Abergwili electoral ward.

The 17th/18th century scholar and collector of Welsh manuscripts, Iaco ab Dewi, is buried in the parish cemetery.