George Spencer-Churchill, 8th Duke of Marlborough

His Grace The Duke of Marlborough DL
The Duke of Marlborough, 1876.
Member of the House of Lords as Duke of Marlborough
In office 16 April 1883 – 9 November 1892
Preceded by	John Spencer-Churchill
Succeeded by	Charles Spencer-Churchill
Personal details
Born	13 May 1844
Died	9 November 1892(1892-11-09) (aged 48) Blenheim Palace, , England
Nationality	British
Spouse(s)	Lady Albertha Hamilton Lillian Warren Price

George Charles Spencer-Churchill, 8th Duke of Marlborough DL (13 May 1844 – 9 November 1892), styled Earl of Sunderland until 1857 and Marquess of Blandford between 1857 and 1883, was a British peer.

Marlborough was the eldest son of John Spencer-Churchill, 7th Duke of Marlborough and Lady Frances Anne Emily Vane, daughter of Charles Vane, 3rd Marquess of Londonderry. He was the elder brother of Lord Randolph Churchill and the uncle of Winston Churchill. He was educated at Eton College between 1857 and 1860 and later joined the army, gaining the rank of Lieutenant in 1863 in the service of the Royal Horse Guards. He was initiated into the rite of Freemasonry in January 1871 along with his brother Randolph, in the Churchill Lodge in London.

Marlborough married firstly, Lady Albertha Frances Anne Hamilton, daughter of James Hamilton, 1st Duke of Abercorn, on 8 November 1869 at Westminster Palace. She was unkindly described by her mother-in-law as "stupid, pious and dull". They were divorced on 20 November 1883, shortly after Marlborough inherited the dukedom after the death of his father. Though the new duchess was technically Albertha, Duchess of Marlborough after their divorce, she preferred to use the title she used throughout most of the couple's married life and was known as Albertha, Marchioness of Blandford. They had four children:

While married to Albertha, he fathered an illegitimate son, later known as Guy Bertrand (b. 4 November 1881), by Edith Peers-Williams (d. 1897) who was still married to Heneage Finch, 7th Earl of Aylesford (1849–1885). In an attempt to pressure Lord Aylesford to drop his divorce suit, Lady Aylesford and Marlborough's younger brother, Lord Randolph Churchill, threatened the Princess of Wales that they would subpoena the Prince of Wales (who was touring India at the time) as a witness in the divorce.