upright|thumb|William Cadogan, <br> 1st Earl Cadogan

thumb|[[Garter stall plate of the 5th Earl Cadogan (1840-1915), in St George's Chapel, Windsor Castle. Arms: Quarterly 1 & 2: Gules, a lion rampant reguardant or (Cadogan); 2 & 3: Argent, three boar's heads couped sable. Crest: Out of a ducal coronet or a dragon's head vert The sinister supporter wears the Cross of the Austrian Military Order of Maria Theresa, commemorating the naval services of the 3rd Earl]]

thumb|Racing Colours of Lord Cadogan

Earl Cadogan is a title that has been created twice in the Peerage of Great Britain for the Cadogan family. The second creation, in 1800, was for Charles Cadogan, 3rd Baron Cadogan.

History

Of Welsh origin, the family name was spelt Cadwgan until the early 15th century. According to Burke's Peerage, the family descends from: Rees ap Griffith ap Llewelyn ap Meredith Bengoch ap Howell (Lord of Penbuallt) ap Sitsylt (Lord of Builth) ap Llewelyn (Lord of Builth) ap Cadwgan ap Elystan Glodrydd ("The Renowned"), Prince of Fferreg, of Dol-y-Gaer, Breconshire.

Earls Cadogan, First Creation (1718)

  • William Cadogan, 1st Earl Cadogan (1672–1726)

Barons Cadogan (1716)

  • William Cadogan, 1st Earl Cadogan (1672–1726)
  • Charles Cadogan, 2nd Baron Cadogan (1685–1776)
  • Charles Sloane Cadogan, 3rd Baron Cadogan (1728–1807) (created Earl Cadogan in 1800)

Earls Cadogan, Second Creation (1800)

  • Charles Sloane Cadogan, 1st Earl Cadogan (1728–1807)
  • Charles Henry Sloane Cadogan, 2nd Earl Cadogan (1749–1832)
  • George Cadogan, 3rd Earl Cadogan (1783–1864)
  • Henry Charles Cadogan, 4th Earl Cadogan (1812–1873)
  • George Henry Cadogan, 5th Earl Cadogan (1840–1915)
  • Gerald Oakley Cadogan, 6th Earl Cadogan (1869–1933)
  • William Gerald Charles Cadogan, 7th Earl Cadogan (1914–1997)
  • Charles Gerald John Cadogan, 8th Earl Cadogan (1937–2023)
  • Edward Charles Cadogan, 9th Earl Cadogan (b.1966)

Present peer

Edward Charles Cadogan, 9th Earl Cadogan (born 10 May 1966) is the son of the 8th Earl Cadogan and his wife Lady Philippa Dorothy Bluet Wallop, a daughter of Gerard Wallop, 9th Earl of Portsmouth. He was educated at St David's College, Llandudno, and served with the Royal Air Force during the Gulf War. He was styled as Viscount Chelsea between 1997 and 2023, when he succeeded to the peerages. He was appointed Deputy lieutenant of Greater London in 2012, becoming Representative Deputy Lieutenant for Kensington & Chelsea in 2022.

The heir apparent is the present holder's eldest son George Edward Charles Diether Cadogan, Viscount Chelsea (b. 1995).