Llwyncelyn

Llwyncelyn is a Welsh place name. It may refer to:


 * Llwyncelyn, Ceredigion
 * Llwyncelyn, Rhondda Cynon Taf
 * Llwyn-celyn Farmhouse, Llanvihangel Crucorney, a Grade I-listed building in Monmouthshire
 * Llwyn-celyn farmhouse, Shirenewton, a Grade II-listed building in Monmouthshire
 * Llwyn Celyn Fault, a geological fault
 * Llwyn y Celyn Wetland, a Site of Special Scientific Interest in Monmouthshire