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.
The 4th Baronet was a soldier who took part in the New Zealand Wars from 1863 to 1865, and the Second Anglo-Afghan War. He died in 1907, and the title became extinct.
Riddell baronets, of Ardnamurchan (1778) Sir James Riddell, 1st Baronet (died 1797) Sir James Milles Riddell, 2nd Baronet (1787–1861) Sir Thomas Miles Riddell, 3rd Baronet (1822–1883) Sir Rodney Stuart Riddell, 4th Baronet (1838–1907), left no heir.
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