Rhostyllen is a village in Wrexham county borough in Wales, south-west of the town of Wrexham. At the time of the 2001 census, area Wrexham 014A, which includes Rhostyllen itself, had a population of 1,383 in 599 households. Its name may be derived from the Welsh words rhos ("moor", or "rush pasture") and estyll ("staves" or "planks"). The eighteenth-century house and parkland at Erddig, now owned by the National Trust, is nearby.