Port Penrhyn

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File:Port Penrhyn 2, June 2011.jpg

Port Penrhyn ({{langx|cy|Porth Penrhyn}}) is a harbour located just east of Bangor in north Wales at the confluence of the River Cegin with the Menai Strait. It was formerly of great importance as the main port for the export of slate from the Penrhyn Quarry,{{cite web|url=https://museum.wales/slate/whatson/10240/SLATE-TO-THE-SEA-/|title=Slate to the Sea|publisher=National Slate Museum|access-date=17 January 2020}} the largest slate quarry in the world at the end of the nineteenth century. The quarry and the port were connected by the Penrhyn Quarry Railway.{{cite news|last1=Quine |first1=Dan |author-link=Dan Quine |title=The development of Port Penrhyn, Part one: 1760-1879 |date=June 2021 |issue=110 |work=Archive |publisher=Lightmoor Press}}

It was built, and later expanded, by the Pennant (later Douglas-Pennant) family of the nearby Penrhyn Castle.

Penrhyn is the Welsh word for 'promontory'.

The port is used by coastal vessels up to about {{DWT|3000|metric|disp=long}} and by fishing vessels.