Thomas Lister, 4th Baron Ribblesdale (29 October 1854 – 21 October 1925) was a British Liberal politician.
Thomas Lister was born on 29 October 1854 in Fontainebleau, France, Ribblesdale was the eldest son of Thomas Lister, 3rd Baron Ribblesdale (1828–1876), and his wife Emma (née Mure) (1833–1911) daughter of William Mure, and succeeded his father in the barony in 1876.
Lord Ribblesdale sat on the Liberal benches in the House of Lords and served as a Lord-in-Waiting (government whip in the House of Lords) under William Ewart Gladstone from 1880 to 1885 and in 1886 and as Master of the Buckhounds under Gladstone and later Lord Rosebery from 1892 to 1895. Apart from his political career he was also a Captain in the Rifle Brigade and a Trustee of the National Gallery from 1909 to 1925.
His portrait was painted by John Singer Sargent and is said to epitomise the British aristocrat.
On 7 April 1877, Lord Ribblesdale married Charlotte Monkton Tennant (1858-1911), daughter of Sir Charles Tennant, 1st Baronet (1823-1906) and Emma Winsloe (1849-1895), and sister of Margot Tennant, at Savoy Chapel in London. Before Lady Ribblesdale died on 2 May 1911, they had:
- Hon. Thomas Lister (1878–1904), a Captain who was killed in action during the Somaliland campaign of 1903 to 1904
- Hon. Barbara Lister (1880–1943), who married Sir Mathew Wilson, 4th Baronet (1875–1958), and had three sons
- Hon. Charles Alfred Lister (1887–1915), a 2nd Lt. who died from wounds received at the Battle of Gallipoli during the First World War.
- Hon. Laura Lister (1892–1965), who married Simon Fraser, 14th Lord Lovat (1871–1933)
- Hon. Diana Lister (1893–1983), who first married Captain Percy Lyulph Wyndham, then Captain Arthur "Boy" Capel (1881–1919), and thirdly Vere Fane, 14th Earl of Westmorland (1893–1948)
On 3 June 1919, Lord Ribblesdale married secondly Ava Lowle Willing, daughter of Edward Shippen Willing and Alice B. Barton and former wife of John Jacob Astor IV, at St Mary's, Bryanston Square in London.
He died on 21 October 1925, aged 70 at his townhouse on Grosvenor Square in Mayfair, London and he was buried in the Lister vault at St Mary the Virgin Churchyard in Gisburn, Lancashire. With his death the barony became extinct. Lady Ava Ribblesdale died on June 9, 1958 in her apartment at 720 Park Avenue in New York City and she was buried in Trinity Church Cemetery.
Among his grandchildren were Simon Fraser, 15th Lord Lovat and 4th Baron Lovat (1911–1995), Sir Hugh Fraser (1918–1984), the Secretary of State for Air from 1962 to 1964, David Fane, 15th Earl of Westmorland (1924–1993), Julian Fane (1927–2009), the author.