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Earl of Lanesborough was a title in thePeerage of Ireland. It was created in 1756 forHumphrey Butler, 2nd Viscount Lanesborough. The Butler family descended fromTheophilus Butler, who representedCounty Cavan andBelturbet in theIrish House of Commons. In 1715 he was raised to the Peerage of Ireland asBaron Newtown-Butler, of the County of Fermanagh, with remainder to the heirs male of his father. He was succeeded according to the special remainder by his brother,Brinsley, the second Baron. He had previously representedKells and Belturbet in the Irish Parliament. In 1728 he was createdViscount Lanesborough in the Peerage of Ireland. He was succeeded by his son, Humphrey, the aforementioned second Viscount, who was elevated to an earldom in 1756. The first Earl was succeeded by his son, Brinsley, the second Earl. He represented County Cavan in the Irish House of Commons. His grandson, the fifth Earl, sat in the BritishHouse of Lords as anIrish representative peer from 1849 to 1866. The latter was succeeded by his nephew, the sixth Earl. He served asLord-Lieutenant of Cavan from 1876 to 1900 and was an Irish Representative Peer from 1870 to 1905. He was succeeded by his son, the seventh Earl. He was an Irish Representative Peer from 1913 to 1929. On his death the titles passed to his younger brother, the eighth Earl. The titles became extinct on the death of the latter's eldest son, the ninth Earl, in December 1998.

The HonourableJohn Butler, younger son of the first Viscount, was a member of the Irish Parliament forNewcastle between 1743 and 1783.

The Butler family trace their lineage back to county ofHuntingdon and George Butler who resided atFen Drayton in 1575 who had six sons one son Stephen Butler who settled inBelturbet County of Cavan in Ireland.Stephen Butler's son Theophilus Butler was created Baron of Newtown-Butler and began family descent.

• Theophilus Butler, 1st Baron Newtown-Butler (c. 1669 – 1723)
• Brinsley Butler, 2nd Baron Newtown-Butler (1670–1735) (createdViscount Lanesborough in 1728)

• Brinsley Butler, 1st Viscount Lanesborough (1670–1735)
• Humphrey Butler, 2nd Viscount Lanesborough (c. 1700–1768) (createdEarl of Lanesborough in 1756)

• Humphrey Butler, 1st Earl of Lanesborough (c. 1700–1768)
• Brinsley Butler, 2nd Earl of Lanesborough (1728–1779)
• Robert Herbert Butler, 3rd Earl of Lanesborough (1759–1806)
• Brinsley Butler, 4th Earl of Lanesborough (1783–1847)
• George John Danvers Butler-Danvers, 5th Earl of Lanesborough (1794–1866)
• John Vansittart Danvers Butler, 6th Earl of Lanesborough (1839–1905)
• Charles John Brinsley Butler, 7th Earl of Lanesborough (1865–1929)
• Henry Cavendish Butler, 8th Earl of Lanesborough (1868–1950)
• Denis Anthony Brian Butler, 9th Earl of Lanesborough (1918–1998)

• Swithland Hall
• Swithland
• Newtownbutler
• Lanesborough-Ballyleague
• Carter-Campbell of Possil
• Viscount Lanesborough
• The Lanesborough, formerly Lanesborough House, the London home of the Viscounts Lanesborough

• Hesilrige, Arthur G. M. (1921).Debrett's Peerage and Titles of courtesy. 160A,Fleet street,London, UK:Dean & Son. p. 537.{{cite book}}: CS1 maint: location (link)
• Leigh Rayment's Peerage Pages^{[self-published source][better source needed]}
• Cracroftspeerage^{[unreliable source?]}

• Extinct earldoms in the Peerage of Ireland
• Earls of Lanesborough
• Noble titles created in 1756

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