There have been three Baronetcies created for people with the surname Riddell, one in the Baronetage of Nova Scotia, one in the Baronetage of Great Britain and one in the Baronetage of the United Kingdom.

The Riddell Baronetcy, of Riddell in the County of Roxburgh, was created in the Baronetage of Nova Scotia on 14 May 1628 for John Riddell. Sir John Riddell's lands were erected into the barony and regality

Regality

A regality was a territorial jurisdiction in old Scots law which might be created by the King only, by granting lands to a subject in liberam regalitatem, and also the tract of land over which such a right extended....

 of New Riddell. Sir John’s third son, William, was knighted by Charles I

Charles I of England

Charles I was King of England, King of Scotland, and King of Ireland from 27 March 1625 until his execution in 1649. Charles engaged in a struggle for power with the Parliament of England, attempting to obtain royal revenue whilst Parliament sought to curb his Royal prerogative which Charles...

 and later served in the Eighty Years' War also known as the Netherlands' War of Independence. The Reverend Archibald Riddell, the third son of the second Baronet, was a minister of the reformed church in Edinburgh

Edinburgh

Edinburgh is the capital city of Scotland, the second largest city in Scotland, and the eighth most populous in the United Kingdom. The City of Edinburgh Council governs one of Scotland's 32 local government council areas. The council area includes urban Edinburgh and a rural area...

 who was persecuted and imprisoned because he would not renounce his Covenanter beliefs; unlike many others, however, he escaped with his life. Sir John Buchanan Riddell, MP for Selkirk, married in 1805 the eldest daughter of the Earl of Romney. In September 1998 the 13th Baronet, Sir John, was recognised by the Lord Lyon as Chief of the name.

The Riddell Baronetcy, of Ardnamurchan in the County of Argyll, was created in the Baronetage of Great Britain on 2 September 1778 for James Riddell. He was superintendent general to the Society of British Fishery and a Fellow of the Society of Arts and Sciences. Sir Rodney Riddell, the fourth and last Baronet, was a distinguished professional soldier who campaigned in New Zealand and during the Afghan War of 1878 to 1880. He died in 1907 and the title became extinct on his death.

The Riddell Baronetcy, of Walton in the County of Surrey, was created in the Baronetage of the United Kingdom on 31 January 1918 for George Allardice Riddell. Sir George was a prominent newspaper proprietor who was subsequently created Baron Riddell. Thus the Baronetcy became a subsidiary title until it became extinct on his death in 1934.

Riddell Baronets, of Riddell (1628)

• Sir John Riddell, 1st Baronet (d. 1632)
• Sir Walter Riddell, 2nd Baronet (d. c. 1669)
• Sir John Riddell, 3rd Baronet (d. 1 April 1700)
• Sir Walter Riddell, 4th Baronet (1664 – 27 April 1747)
• Sir Walter Riddell, 5th Baronet (1695 – 13 May 1765)
• Sir John Riddell, 6th Baronet (1726 – 16 April 1768)
• Sir Walter Buchanan Riddell, 7th Baronet (1763 – 7 February 1784)
• Sir James Buchanan Riddell, 8th Baronet (1765 – 4 September 1784)
• Sir John Buchanan Riddell, 9th Baronet (1768 – 26 April 1819)
• Sir Walter Buchanan Riddell, 10th Baronet (8 August 1810 – 27 August 1892)
• Sir James Walter Buchanan Riddell, 11th Baronet
  Sir John Buchanan-Riddell, 11th Baronet
  Sir John Walter Buchanan-Riddell, 11th Baronet was a British barrister and baronet. He was educated at Eton College and Christ Church, Oxford before being called to the bar by Inner Temple in 1874. He succeeded his uncle as 11th Baronet in the line of Riddell Baronets in 1892...
  
   (14 March 1849 – 31 October 1924)
• Sir Walter Robert Buchanan Riddell, 12th Baronet
  Sir Walter Riddell, 12th Baronet
  Sir Walter Robert Buchanan-Riddell, 12th Baronet was a British academic. He was educated at Eton College and Christ Church, Oxford. He was Principal of Hertford College, Oxford between 1922 and 1929. He succeeded his father as 12th Baronet in the line of Riddell Baronets in 1924...
  
   (21 April 1879 – 5 June 1934)
• Sir John Charles Buchanan Riddell, 13th Baronet (3 January 1934 – 24 July 2010)
• Sir Walter John Riddell, 14th Baronet (b. 1974)

Riddell Baronets, of Ardnamurchan (1778)

• Sir James Riddell, 1st Baronet (d. 2 Nov 1797)
• Sir James Miles Riddell, 2nd Baronet (3 June 1787 - 22 September 1861)
• Sir Thomas Miles Riddell, 3rd Baronet (25 December 1822 - 18 July 1883)
• Sir Rodney Stuart Riddell, 4th Baronet (7 March 1838 -2 Jan 1907)