Sydney Seymour Hyde Stanhope, 6th Earl of Harrington (27 September 1845 – 22 February 1866) was an English peer.

[1] Stanhope inherited the Earldom in 1862, at the age of 16, following the death of his father.

Lord Harrington died 22 February 1866, aged 20; unmarried and without issue.

[2][1] He was succeeded by his first cousin Charles Wyndham Stanhope, 7th Earl of Harrington.

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