There have been two Baronetcies created for persons with the surname Grimston, once in the Baronetage of England and once in the Baronetage of the United Kingdom. One creation is extant as of 2010.

The Grimston Baronetcy, of Bradfield in the County of Essex, was created in the Baronetage of England on 25 November 1611 for Harbottle Grimston

Sir Harbottle Grimston, 1st Baronet

Sir Harbottle Grimston, 1st Baronet was an English politician who sat in the House of Commons variously between 1614 and 1648. He supported the Parliamentarian side in the English Civil War....

. He later represented Harwich

Harwich (UK Parliament constituency)

Harwich was a parliamentary constituency represented in the House of Commons of the Parliament of the United Kingdom. Until its abolition for the 2010 general election it elected one Member of Parliament by the first past the post system of election....

 and Essex

Essex (UK Parliament constituency)

Essex was a constituency represented in the House of Commons of the Parliament of the United Kingdom from 1290 until 1832. It elected two MPs, traditionally referred to as Knights of the Shire, to the House of Commons...

 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...

. His son, the second Baronet, served as Speaker of the House of Commons

Speaker of the British House of Commons

The Speaker of the House of Commons is the presiding officer of the House of Commons, the United Kingdom's lower chamber of Parliament. The current Speaker is John Bercow, who was elected on 22 June 2009, following the resignation of Michael Martin...

 and as Master of the Rolls

Master of the Rolls

The Keeper or Master of the Rolls and Records of the Chancery of England, known as the Master of the Rolls, is the second most senior judge in England and Wales, after the Lord Chief Justice. The Master of the Rolls is the presiding officer of the Civil Division of the Court of Appeal...

. His son, the third 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 St Albans

St Albans (UK Parliament constituency)

St Albans is a parliamentary constituency represented in the House of Commons of the Parliament of the United Kingdom. Established in 1885, it is a county constituency in Hertfordshire, and elects one Member of Parliament by the first past the post system of election.From 1554 to 1852 there was a...

. However, on his death in 1700 the title became extinct. The Grimston estates passed to his great-nephew William Luckyn

William Grimston, 1st Viscount Grimston

William Grimston, 1st Viscount Grimston was a British peer and Member of Parliament.Born William Luckyn, Grimston was the younger son of Sir William Luckyn, 3rd Baronet, and Mary Sherrington. In 1700 he succeeded to the estates of his great-uncle Sir Samuel Grimston, 3rd Baronet, of Bradfield, and...

, who assumed the surname of Grimston and was created Viscount Grimston in 1719. He was the ancestor of the Earls of Verulam

Earl of Verulam

Earl of Verulam is a title in the Peerage of the United Kingdom. It was created in 1815 for James Grimston, 4th Viscount Grimston. He was made Viscount Grimston at the same time. Verulam had previously represented St Albans in the House of Commons. In 1808 he had also succeeded his maternal cousin...

.

The Grimston Baronetcy, of Westbury in the County of Wiltshire, was created on 11 March 1952 for Robert Grimston

Robert Grimston, 1st Baron Grimston of Westbury

Robert Villiers Grimston, 1st Baron Grimston of Westbury was a British Conservative politician.The eldest son of the Rev. and Hon...

, a grandson of the second Earl of Verulam. He was later elevated to the peerage as Baron Grimston of Westbury

Baron Grimston of Westbury

Baron Grimston of Westbury, of Westbury in the County of Wiltshire, is a title in the Peerage of the United Kingdom. It was created in 1964 for the Conservative politician and former Deputy Speaker of the House of Commons, Sir Robert Grimston, 1st Baronet. He had already been created a Baronet in...

. For more information, see this title.

Grimston Baronets, of Bradfield (1611)

• Sir Harbottle Grimston, 1st Baronet
  Sir Harbottle Grimston, 1st Baronet
  Sir Harbottle Grimston, 1st Baronet was an English politician who sat in the House of Commons variously between 1614 and 1648. He supported the Parliamentarian side in the English Civil War....
  
   (c. 1569-1648)
• Sir Harbottle Grimston, 2nd Baronet (1603-1685)
• Sir Samuel Grimston, 3rd Baronet
  Sir Samuel Grimston, 3rd Baronet
  Sir Samuel Grimston, 3rd Baronet , was a politician.Grimston was the second and only one of the six sons of Sir Harbottle Grimston, 2nd Baronet who survived him. He was born 7 January 1643. His mother was Sir Harbottle's first wife, Mary, daughter of Sir George Croke. He was elected member of...
  
  (1644-1700)