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
See also Llyn Celyn