The title of Earl of Lonsdale has been created twice - first in the Peerage of Great Britain in 1784 (becoming extinct in 1802), and then in the Peerage of the United Kingdom in 1807, both times for members of the Lowther family.
The Earl bears the subsidiary titles of Viscount Lowther (1797) and Baron Lowther (1797), both in the Peerage of Great Britain, and is a baronet of Great Britain (1764).
Earls of Lonsdale, First Creation (1784)
- James Lowther, 1st Earl of Lonsdale (1736-1802)
Earls of Lonsdale, Second Creation (1807)
- William Lowther, 1st Earl of Lonsdale (1757-1844)
- William Lowther, 2nd Earl of Lonsdale (1787-1872)
- Henry Lowther, 3rd Earl of Lonsdale (1818-1876)
- George Henry Lowther, 4th Earl of Lonsdale (1855-1882)
- Hugh Cecil Lowther, 5th Earl of Lonsdale (1857-1944)
- Lancelot Edward Lowther, 6th Earl of Lonsdale (1867-1953)
- James Hugh William Lowther, 7th Earl of Lonsdale (b. 1922)