William Hopetoun Carnegie, 8th Earl of Northesk (16 October 1794 – 1878) was a British peer. Born to William Carnegie, 7th Earl of Northesk and Mary Ricketts, he died on 5 December 1878 at age of 84. Lord Northesk married Georgiana Maria Elliot, daughter of Admiral Sir George Elliot and Eliza Cecilia Ness, on 14 February 1843 and had two children:

• Margaret Mary Adeliza Carnegie (d. 27 September 1871)
• Lt.-Col. George John Carnegie, 9th Earl of Northesk (1 December 1843–9 September 1891)

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Northesk was paid £3,529 from the British government under the terms of the Slave Compensation Act 1837, as he was a trustee for the "Canaan" slave plantation in the British colony of Jamaica, which was owned by Edward Jervis Jervis, 2nd Viscount St Vincent.^[1]