Earl Spencer may refer to:
The Spencer family is an aristocratic British family. From the 16th century, its members have held numerous titles, including the dukedom of Marlborough, the earldoms of Sunderland and Spencer, and the Churchill barony. Two prominent members of the family during the 20th century were Sir Winston Churchill and Diana, Princess of Wales.
An ahnentafel or ahnenreihe is a genealogical numbering system for listing a person's direct ancestors in a fixed sequence of ascent. The subject of the ahnentafel is listed as No. 1, the subject's father as No. 2 and the mother as No. 3, the paternal grandparents as No. 4 and No. 5 and the maternal grandparents as No. 6 and No. 7, and so on, back through the generations. Apart from No. 1, who can be male or female, all even-numbered persons are male, and all odd-numbered persons are female. In this schema, the number of any person's father is double the person's number, and a person's mother is double the person's number plus one. Using this definition of numeration, one can derive some basic information about individuals who are listed without additional research.
Althorp is a Grade I listed stately home and estate in the civil parish of Althorp, in West Northamptonshire, England of about 13,000 acres (5,300 ha). By road it is about 6 miles (9.7 km) northwest of the county town of Northampton and about 75 miles (121 km) northwest of central London, situated between the villages of Great Brington and Harlestone. It has been held by the prominent aristocratic Spencer family for more than 500 years, and has been owned by Charles Spencer, 9th Earl Spencer since 1992. It was also the home of Lady Diana Spencer from her parents' divorce until her marriage to Charles, Prince of Wales.
Earl Spencer is a title in the Peerage of Great Britain that was created on 1 November 1765, along with the title Viscount Althorp, of Althorp in the County of Northampton, for John Spencer, 1st Viscount Spencer. He was a member of the prominent Spencer family and a great-grandson of the 1st Duke of Marlborough. Previously, he had been created Viscount Spencer, of Althorp in the County of Northampton, and Baron Spencer of Althorp, of Althorp in the County of Northampton, on 3 April 1761.
The title Duke of Abercorn is a title in the Peerage of Ireland. It was created in 1868 and bestowed upon James Hamilton, 2nd Marquess of Abercorn. Although the Dukedom is in the Peerage of Ireland, it refers to Abercorn, West Lothian, and the Duke also bears four titles in the Peerage of Scotland and two in the Peerage of Great Britain, and is one of three peers who have titles in those three peerages. The Duke of Abercorn also claims the French title of Duke of Châtellerault, created in 1548.

Frances Ruth Shand Kydd was the mother of Diana, Princess of Wales. She was the maternal grandmother of William, Prince of Wales and Prince Harry, Duke of Sussex, respectively first and fifth in the line of succession to the British throne. Following her divorce from Viscount Althorp in 1969, and Diana's death in 1997, Shand Kydd devoted the final years of her life to Catholic charity work following her conversion to Catholicism.
John Spencer may refer to:

Edward John Spencer, 8th Earl Spencer, styled Viscount Althorp until June 1975, was a British nobleman, military officer, and courtier. He was the father of Diana, Princess of Wales, and the maternal grandfather of William, Prince of Wales, and Prince Harry, Duke of Sussex.
Charles Edward Maurice Spencer, 9th Earl Spencer,, styled Viscount Althorp between 1975 and 1992, is a British peer, author, journalist, and broadcaster. He is the younger brother of Diana, Princess of Wales, and the maternal uncle of William, Prince of Wales, and Prince Harry, Duke of Sussex.
Charles Spencer, 3rd Duke of Marlborough,, styled as The Honourable Charles Spencer between 1706 and 1729 and as the Earl of Sunderland between 1729 and 1733, was a British Army officer, politician and peer who served as Lord Privy Seal in 1755. He led the British forces involved in the raid on St Malo in 1758.
Louis Frederick John Spencer, Viscount Althorp, is a British aristocrat and eldest son and heir of Charles Spencer, 9th Earl Spencer. He is the nephew of Diana, Princess of Wales, and the first cousin of William, Prince of Wales and Prince Harry, Duke of Sussex.
Cynthia Ellinor Beatrix Spencer, Countess Spencer was a British peeress and the paternal grandmother of Diana, Princess of Wales.
Charles Spencer may refer to:

Raine Spencer, Countess Spencer was a British socialite and local politician. She was the daughter of Alexander McCorquodale and the romantic novelist and socialite Barbara Cartland and the stepmother of Diana, Princess of Wales.
Anne Churchill, later Anne Spencer, Countess of Sunderland, was an English court official and noble. She once held the office of Lady of the Bedchamber to Queen Anne.
McCorquodale is a surname of Scottish origin. The name originates from Argyll in the West Highlands.
Countess Spencer may refer to:
Edward Spencer may refer to:
Lady Sarah may refer to: