The Williams, later Williams-Bulkeley Baronetcy, of Penrhyn in the County of Caernarvon, is a title in the Baronetage of England.
The second Baronet represented both Caernarvonshire and Caernarvon in the House of Commons.
The tenth Baronet was Member of Parliament for Beaumaris, Anglesey and Flint Boroughs and served as Lord Lieutenant of Caernarvonshire.
Arms of Williams of Penrhyn: Gules, a chevron ermine between three Saxon's heads in profile couped proper.
The heir apparent is the present baronet's elder twin son, Richard Hugh Williams-Bulkeley (born 1968).