Penllyn

Penllyn may refer to the following places:

United States

 * Penllyn, a village in Lower Gwynedd Township, Montgomery County, Pennsylvania

Wales

 * Penllyn, Gwynedd, a former civil parish in Gwynedd (1894–1974)
 * Penllyn, Vale of Glamorgan, a village and community in the Vale of Glamorgan
 * Penllyn (cantref), an ancient cantref of Gwynedd