The title of Earl Cadogan was created twice in the Peerage of Great Britain, first in 1718 and then in 1800.

The Earl holds the subsidiary titles of Viscount Chelsea (1800) and Baron Cadogan of Oakley (1718), both in the Peerage of Great Britain.

Earls Cadogan, First Creation (1718)

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

Barons Cadogan of Oakley (1718)

• William Cadogan, 1st Earl Cadogan (1672-1726)
• Charles Cadogan, 2nd Baron Cadogan of Oakley (1685-1776)
• Charles Sloane Cadogan, 3rd Baron Cadogan of Oakley (1728-1807) (became 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 (b. 1937)