Plas Newydd may refer to:

• Plas Newydd (Anglesey), a historic house and garden on Anglesey, Wales, United Kingdom
• Plas Newydd, Llangollen, a historic house and garden in Llangollen, Denbighshire, Wales, United Kingdom

• Plasnewydd, a neighbourhood in Cardiff.

This disambiguation page lists articles associated with the title Plas Newydd.
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