John Stuart Bligh, 6th Earl of Darnley (16 April 1827 – 14 December 1896), styled Lord Clifton from 1831 to 1835, was a British peer.
The eldest son of Edward Bligh, 5th Earl of Darnley, he succeeded his father in the earldom in 1835. He was appointed a deputy lieutenant of Kent on 3 September 1847. Darnley matriculated at Christ Church, Oxford on 15 May 1845 and received his BA in 1848 and his MA in 1869.
On 24 July 1848, he was commissioned captain of the Cobham Troop of the West Kent Yeomanry. He was promoted to major on 18 April 1859, and to lieutenant-colonel on 28 April 1863. He retired from the Yeomanry on 9 September 1874, retaining his rank.
On 31 August 1850, Darnley married Lady Harriet Mary Pelham, the daughter of Henry Pelham, 3rd Earl of Chichester, by whom he had eight children:
Darnley died on 14 December 1896 and was succeeded by his eldest son, Edward.