There have been twenty one baronetcies created for persons with the surname Williams, eight in the Baronetage of England, three in the Baronetage of Great Britain and ten in the Baronetage of the United Kingdom. Only six of the creations are extant .
The Williams Baronetcy, of Vaynol in the County of Carnarvon, was created in the Baronetage of England on 15 June 1622 for William Williams. The sixth Baronet represented Caernarvonshire in the House of Commons. On his death in 1696 the title became extinct.
The Williams Baronetcy, of Marnhull in the County of Dorset, was created in the Baronetage of England on 19 April 1642 for Edmund Williams. The title became extinct on the death of the second Baronet in 1680.
The Williams Baronetcy, of Minster in the County of Kent, was created in the Baronetage of England on 22 April 1642 for John Williams. The title became extinct on his death in 1669.
The Williams Baronetcy, of Llangibby in the County of Monmouth, was created in the Baronetage of England on 14 May 1642 for Trevor Williams. He later sat as Member of Parliament for Monmouthshire and Monmouth. The second Baronet also represented these constituencies in the House of Commons while the third Baronet sat for Monmouthshire. On the death of the fifth Baronet in 1753 the title became extinct.
The Williams Baronetcy, of Guernevet in the County of Brecon, was created in the Baronetage of England on 4 May 1644 for Henry Williams. He had earlier represented Breconshire in Parliament. The second Baronet sat as Member of Parliament for Brecon. The title became extinct on the death of the third Baronet in .
The Williams, later Williams-Bulkeley Baronetcy, of Penryn in the County of Cornwall, was created in the Baronetage of England on 17 June 1661 for Griffith Williams. For more information on this creation, see Williams-Bulkeley baronets.
The Williams Baronetcy, of Elham in the County of Kent, was created in the Baronetage of England on 12 November 1674 for Thomas Williams, Physician to Charles I and James II. He was later Member of Parliament for Weobley 1675-8. His son, the second Baronet was High Sheriff of Kent in 1668 and represented Herefordshire 1701-5. His nephew succeeded as the third Baronet but the Elham estate passed to his daughter and her husband Thomas Symonds. The fourth and fifth Baronets were sons of the third Baronet. On the latter's death in 1804 the title became either extinct or dormant.
The Williams, later Williams-Wynn Baronetcy, of Gray's Inn in the City of London, was created in the Baronetage of England on 6 July 1688 for Williams Williams. For more information on this creation, see Williams-Wynn baronets.
The Williams Baronetcy, of Edwinsford in the County of Carmarthen, was created in the Baronetage of Great Britain on 30 July 1707 for Nicholas Williams. He was later Member of Parliament for Carmarthenshire. The title became extinct on his death in 1745. The arms of Williams of Edwinsford are: Argent, a lion rampant sable, face, paws & tuft of the tail of the field.
The Williams Baronetcy, of Clapton in the County of Northampton, was created in the Baronetage of Great Britain on 4 April 1747 for Hutchins Williams. The second Baronet represented New Shoreham in the House of Commons. The title became extinct on the death of the third Baronet in 1784.
The Williams Baronetcy, of Bodelwyddan in the County of Flint, was created in the Baronetage of Great Britain on 24 July 1798 for John Williams. He had previously served as High Sheriff of Flintshire. Williams was the great-grandson of John Williams, second son of Sir William Williams, 1st Baronet (see Williams-Wynn Baronets). The second Baronet assumed in 1842 the additional surname of Hay but died without male issue. The title became extinct on the death of the ninth baronet in 2018.
The Williams Baronetcy, of Kars, was created in the Baronetage of the United Kingdom on 18 July 1856 for the soldier William Williams, who represented Calne in Parliament. The title became extinct on his death in 1883.
The Williams Baronetcy, of Tregullow in the County of Cornwall, was created in the Baronetage of the United Kingdom on 4 August 1866 for William Williams, a younger son of the Williams family of Caerhays and Burncoose, a prominent and wealthy Cornish mining family. He served as High Sheriff of Cornwall. The second Baronet was Conservative Member of Parliament for Truro.
The Williams Baronetcy, of the City of London, was created in the Baronetage of the United Kingdom on 30 October 1894 for John Williams. The title became extinct on his death in 1926.