Tremeirchion is a small residential community in Denbighshire, Wales. It lies on the B5429 road, to the north east of Denbigh and to the east of St Asaph. The community includes the village of Rhuallt.

St Beuno's Jesuit Spirituality Centre, known locally as St Beuno's College, is a spirituality and retreat centre in Tremeirchion, Denbighshire, Wales. It was built in 1847 by the Jesuits, as a theology college. During the 1870s the Victorian poet Gerard Manley Hopkins studied there. Since 1980, it has been a spirituality and retreat centre. Standing on the Clwydian Range, the front of the building faces west towards Snowdonia and overlooks the Vale of Clwyd. The building became a Grade II* listed building and a Welsh Historic Monument in 2002.