Cilycwm (Welsh: Cil-y-cwm, historically Cîl-y-cwm and Kîlycwm) is a village and parish located in Carmarthenshire, Wales. The community population taken at the 2011 census was 489. Cilycwm lies on the west bank of Afon Gwenlais, a tributary of the Tywi, north of the town of Llandovery. Pont Dolauhirion, a bridge that crosses the Tywi at the south of the community was designed by William Edward's and is a copy of his famous bridge at Pontypridd. The bridge is a grade I listed structure The parish church of St Michael's is also a grade I listed building.