The title of Earl Cathcart was created in the Peerage of the United Kingdom in 1814.

The Earl bears the subsidiary titles of Viscount Cathcart (1807) and Baron Greenock (1807) in the Peerage of the UK, and Lord Cathcart (1460) in the Peerage of Scotland.

Lords Cathcart (1460)

• Alan Cathcart, 1st Lord Cathcart (d.1497)
• John Cathcart, 2nd Lord Cathcart (d.1535)
• Alan Cathcart, 3rd Lord Cathcart (d.1547)
• Alan Cathcart, 4th Lord Cathcart (1537-1618)
• Alan Cathcart, 5th Lord Cathcart (1600-1628)
• Alan Cathcart, 6th Lord Cathcart (1628-1709)
• Alan Cathcart, 7th Lord Cathcart (1648-1732)
• Charles Cathcart, 8th Lord Cathcart (1686-1740)
• Charles Schaw Cathcart, 9th Lord Cathcart (1721-1776)
• William Schaw Cathcart, 10th Lord Cathcart (1755-1843) (became Viscount Cathcart in 1807 and Earl Cathcart in 1814)

Earls Cathcart (1814)

• William Schaw Cathcart, 1st Earl Cathcart (1755-1843)
• Charles Murray Cathcart, 2nd Earl Cathcart (1783-1859)
• Alan Frederick Cathcart, 3rd Earl Cathcart (1828-1905)
• Alan Cathcart, 4th Earl Cathcart (1856-1911)
• George Cathcart, 5th Earl Cathcart (1862-1927)
• Alan Cathcart, 6th Earl Cathcart (1919-1999)
• Charles Alan Andrew Cathcart, 7th Earl Cathcart (b. 1952)