Jacob Pleydell-Bouverie, 4th Earl of Radnor (18 September 1815 – 11 March 1889) was a British nobleman and army officer.
He was the son of William Pleydell-Bouverie, 3rd Earl of Radnor and Judith Anne St John-Mildmay.
On 2 October 1837, he was commissioned a cornet in the Salisbury Troop of the Royal Wiltshire Regiment of Yeomanry.
[2] They had twelve children: Folkestone was High Sheriff of Wiltshire for 1846 and was appointed a deputy lieutenant of Berkshire on 2 May 1855.
He succeeded his father as Earl of Radnor in 1869 and was appointed Lord Lieutenant of Wiltshire in 1878.