There have been four Baronetcies created for persons with the surname Johnston (as distinct from Johnstone

Johnstone Baronets

The Johnstone, later Pulteney, later Johnstone Baronetcy, of Westerhall in the County of Dumfries, is a title in the Baronetage of Nova Scotia. It was created on 25 April 1700 for John Johnstone, one of the Scottish representatives to the 1st Parliament of Great Britain, with remainder to his heirs...

), two in the Baronetage of Nova Scotia, one in the Baronetage of Ireland and one in the Baronetage of the United Kingdom. One creation is extant as of 2010.

The Johnston Baronetcy, of Caskiebien in the County of Aberdeen, was created in the Baronetage of Nova Scotia on 31 March 1626 for George Johnston.

The Johnston Baronetcy, of Elphinstone in the County of Haddington, was created in the Baronetage of Nova Scotia on 18 October 1628 for Samuel Johnston. Nothing further is known of the title after the death of the third Baronet in circa 1700.

The Johnston Baronetcy, of Gilford in the County of Down, was created in the Baronetage of Ireland on 27 July 1772 for Richard Johnston, later a member of the Irish House of Commons

Irish House of Commons

The Irish House of Commons was the lower house of the Parliament of Ireland, that existed from 1297 until 1800. The upper house was the House of Lords...

 for Kilbeggan

Kilbeggan (Parliament of Ireland constituency)

Kilbeggan was a constituency represented in the Irish House of Commons from 1612 to 1800.-History:The borough was incorporated by James I by a Charter dated 27 February 1612. The charter conferred upon the elected portreeve and burgesses the right to return two Members to Parliament...

 and Blessington

Blessington (Parliament of Ireland constituency)

Blessington in County Wicklow was a constituency represented in the Irish House of Commons from 1670 until 1800.-History:In the Patriot Parliament of 1689 summoned by King James II, Blessington was represented with two members.-1689–1801:...

. The title became extinct on the death of his son, the second Baronet, in 1841.

The Johnston Baronetcy, of London, was created in the Baronetage of the United Kingdom on 22 January 1916 for Charles Johnston

Sir Charles Johnston, 1st Baronet

Sir Charles Johnston, 1st Baronet , was Lord Mayor of London between 1914 and 1915. Prior to serving as Lord Mayor he was an Alderman and, in 1913, Sheriff of the City of London. He was created a Baronet in January 1916....

, Lord Mayor of London

Lord Mayor of London

The Right Honourable Lord Mayor of London is the legal title for the Mayor of the City of London Corporation. The Lord Mayor of London is to be distinguished from the Mayor of London; the former is an officer only of the City of London, while the Mayor of London is the Mayor of Greater London and...

 between 1914 and 1915. The title became extinct on his death in 1933.

Johnston Baronets, of Caskiebien (1626)

• Sir George Johnston, 1st Baronet (d. c. 1650)
• Sir George Johnston, 2nd Baronet (d. c. 1680)
• Sir John Johnston, 3rd Baronet (c. 1648-1690)
• Sir John Johnston, 4th Baronet (d. 1724)
• Sir William Johnston, 5th Baronet (c. 1675-1750)
• Sir William Johnston, 6th Baronet (1714-1794)
• Sir William Johnston, 7th Baronet (1760-1844)
• Sir William Bacon Johnston, 8th Baronet (1806-1865)
• Sir William Johnston, 9th Baronet (1849-1917)
• Sir George Johnston, 10th Baronet (1849-1921)
• Sir Thomas Alexander Johnston, 11th Baronet (1857-1950)
• Sir Thomas Alexander Johnston, 12th Baronet (1888-1959)
• Sir Thomas Alexander Johnston, 13th Baronet (1916-1985)
• Sir Thomas Alexander Johnston, 14th Baronet (b. 1956)

Johnston Baronets, of Elphinston (1628)

• Sir Samuel Johnston, 1st Baronet (c. 1600-c. 1644)
• Sir John Johnston, 2nd Baronet (d. c. 1666)
• Sir James Johnston, 3rd Baronet (d. c. 1700)

Johnston Baronets, of Gilford (1772)

• Sir Richard Johnston, 1st Baronet (1743-1795)
• Sir William Johnston, 2nd Baronet (1765-1841)