There have been six Baronetcies created for persons with the surname Thomas, three in the Baronetage of England, one in the Baronetage of Great Britain and two in the Baronetage of the United Kingdom. Three of the creations are extant as of 2007.

The Thomas Baronetcy, of Michaelstown in the County of Glamorgan, was created in the Baronetage of England on 3 March 1642 for Edward Thomas. The second Baronet sat as Member of Parliament

Member of Parliament

A Member of Parliament is a representative of the voters to a :parliament. In many countries with bicameral parliaments, the term applies specifically to members of the lower house, as upper houses often have a different title, such as senate, and thus also have different titles for its members,...

 for Cardiff

Cardiff (UK Parliament constituency)

Cardiff was a parliamentary constituency centred on the town of Cardiff in South Wales which returned one Member of Parliament to the House of Commons from 1542 until it was abolished for the 1918 general election.- MPs 1542-1645 :- MPs 1645–1832 :...

. The title became extinct on his death sometime after 1684.

The Thomas Baronetcy, of Folkington in the County of Sussex, was created in the Baronetage of England on 23 July 1660 for William Thomas

Sir William Thomas, 1st Baronet

Sir William Thomas, 1st Baronet was an English politician who sat in the House of Commons from 1661 to 1681.Thomas was created Baronet of Folkington in the County of Sussex, created in the Baronetage of England on 23 July 1660. He was Member of Parliament for Seaford from 1661 to 1681...

, for many years Member of Parliament for Seaford

Seaford (UK Parliament constituency)

The UK parliamentary constituency of Seaford was a Cinque Port constituency, similar to a parliamentary borough, in Seaford, East Sussex. A rotten borough, prone by size to undue influence by a patron, it was disenfranchised in the Reform Act of 1832...

 and Sussex

Sussex (UK Parliament constituency)

Sussex was a constituency of the House of Commons of the Parliament of England then of the Parliament of Great Britain from 1707 to 1800 and of the Parliament of the United Kingdom from 1801 to 1832...

. The title became extinct on his death in 1706.

The Thomas Baronetcy, of Wenvoe in the County of Glamorgan, was created in the Baronetage of England on 24 December 1694 for John Thomas. The third Baronet represented Chippenham

Chippenham (UK Parliament constituency)

Chippenham is a parliamentary constituency, abolished in 1983 but recreated in 2010, and represented in the House of Commons of the Parliament of the United Kingdom. It elects one Member of Parliament by the first past the post system of election...

 and Glamorganshire

Glamorganshire (UK Parliament constituency)

Glamorganshire was a parliamentary constituency in Wales, returning two Members of Parliament to the British House of Commons. The Redistribution of Seats Act 1885 divided it into five new constituencies: East Glamorganshire, South Glamorganshire, Mid Glamorganshire, Gower and Rhondda.- MPs...

 in the House of Commons

British House of Commons

The House of Commons is the lower house of the Parliament of the United Kingdom, which also comprises the Sovereign and the House of Lords . Both Commons and Lords meet in the Palace of Westminster. The Commons is a democratically elected body, consisting of 650 members , who are known as Members...

. The tenth Baronet was admitted to the Privy Council

Privy Council of the United Kingdom

Her Majesty's Most Honourable Privy Council, usually known simply as the Privy Council, is a formal body of advisers to the Sovereign in the United Kingdom...

 in 1958.

The Thomas Baronetcy, of Yapton in the County of Sussex, was created in the Baronetage of Great Britain on 6 September 1766 for George Thomas, Governor of the Leeward Islands from 1753 to 1766. The third Baronet sat as Member of Parliament for Arundel

Arundel (UK Parliament constituency)

Arundel was twice a parliamentary constituency in the Kingdom of England, the Kingdom of Great Britain, and the United Kingdom. The first incarnation strictly comprised the town centre of Arundel and was a borough constituency first enfranchised in 1332 and disfranchised in 1868 under the Reform...

. The title became extinct on the death of the seventh Baronet in 1972.

The Thomas Baronetcy, of Garreglwyd in the County of Anglesey, was created in the Baronetage of the United Kingdom on 5 July 1918 for Robert Thomas

Sir Robert Thomas, 1st Baronet

Sir Robert John Thomas, 1st Baronet was a Welsh businessman and Liberal Party politician, who was twice elected to parliament. Thomas was a ship and insurance broker. He was Member of Parliament for Wrexham from 1918 to 1922, and for Anglesey from 1923 to 1929...

. He was a ship and insurance broker and also represented Wrexham

Wrexham (UK Parliament constituency)

Wrexham is a parliamentary constituency in North Wales which is represented in the House of Commons of the Parliament of the United Kingdom...

 and Anglesey in the House of Commons.

The Thomas Baronetcy, of Ynyshir in the County of Glamorgan, was created in the Baronetage of the United Kingdom on 10 May 1919 for the coalowner and philanthropist James Thomas. He constructed the Welsh National Medical School in Cardiff

Cardiff

Cardiff is the capital, largest city and most populous county of Wales and the 10th largest city in the United Kingdom. The city is Wales' chief commercial centre, the base for most national cultural and sporting institutions, the Welsh national media, and the seat of the National Assembly for...

 and also served as High Sheriff

High Sheriff

A high sheriff is, or was, a law enforcement officer in the United Kingdom, Canada and the United States.In England and Wales, the office is unpaid and partly ceremonial, appointed by the Crown through a warrant from the Privy Council. In Cornwall, the High Sheriff is appointed by the Duke of...

 of Glamorganshire in 1936. His son, the second Baronet, was a Deputy Lieutenant

Deputy Lieutenant

In the United Kingdom, a Deputy Lieutenant is one of several deputies to the Lord Lieutenant of a lieutenancy area; an English ceremonial county, Welsh preserved county, Scottish lieutenancy area, or Northern Irish county borough or county....

 for Gwent

Gwent (county)

Gwent is a preserved county and a former local government county in south-east Wales. It was formed on 1 April 1974, under the Local Government Act 1972, and was named after the ancient Kingdom of Gwent....

 and High Sheriff for Monmouthshire

Monmouthshire (historic)

Monmouthshire , also known as the County of Monmouth , is one of thirteen ancient counties of Wales and a former administrative county....

. As of 2007 the title is held by the latter's son, the third Baronet, who succeeded in 2005.

Thomas Baronets, of Michaelstown (1642)

• Sir Edward Thomas, 1st Baronet (d. 1673)
• Sir Robert Thomas, 2nd Baronet (c. 1622-d. after 1684)

Thomas Baronets, of Wenvoe (1694)

• Sir John Thomas, 1st Baronet (d. 1703)
• Sir Edmond Thomas, 2nd Baronet (1667-1723)
• Sir Edmond Thomas, 3rd Baronet (1712-1767)
• Sir Edmond Thomas, 4th Baronet (c. 1742-1789)
• Sir John Thomas, 5th Baronet (1749-1828)
• Sir John Godfrey Thomas, 6th Baronet (1784-1841)
• Sir Edmond Stephen Thomas, 7th Baronet (1810-1852)
• Sir Godfrey John Thomas, 8th Baronet (1824-1861)
• Sir Godfrey Vignoles Thomas, 9th Baronet (1856-1919)
• Sir Godfrey John Vignoles Thomas, 10th Baronet (1889-1968)
• Sir Godfrey Michael David Thomas, 11th Baronet (1925-2003)
• Sir David John Godfrey Thomas, 12th Baronet (b. 1961)

Thomas Baronets, of Yapton (1766)

• Sir George Thomas, 1st Baronet (d. 1774)
• Sir William Thomas, 2nd Baronet (d. 1777)
• Sir George Thomas, 3rd Baronet
  Sir George Thomas, 3rd Baronet
  Sir George Thomas, 3rd Baronet , was a British politician. He was a Member of Parliament for Arundel 1790–1797 and one of the Thomas Baronets of Yapton.-References:...
  
   (c. 1740-1815)
• Sir William Lewis George Thomas, 4th Baronet (1777-1850)
• Sir William Sidney Thomas, 5th Baronet (1807-1867)
• Sir George Sidney Meade Thomas, 6th Baronet (1847-1918)
• Sir George Alan Thomas, 7th Baronet (1881-1972)

Thomas Baronets, of Garreglwyd (1918)

• Sir Robert John Thomas, 1st Baronet
  Sir Robert Thomas, 1st Baronet
  Sir Robert John Thomas, 1st Baronet was a Welsh businessman and Liberal Party politician, who was twice elected to parliament. Thomas was a ship and insurance broker. He was Member of Parliament for Wrexham from 1918 to 1922, and for Anglesey from 1923 to 1929...
  
  (1873-1951)
• Sir William Eustace Rhyddlad Thomas, 2nd Baronet (1909-1957)
• Sir (William) Michael Marsh Thomas, 3rd Baronet (b. 1930)

Thomas Baronets, of Ynyshir (1919)

• Sir (William) James Thomas, 1st Baronet (1867-1945)
• Sir William James Cooper Thomas, 2nd Baronet (1919-2005)
• Sir William Michael Thomas, 3rd Baronet (b. 1948)