| Date inherited | Date of death or other loss of title
 | Title | Name | Other titles by marriage
 | Preceded in title by | Succeeded in title by | 
|---|
| 1903 | 29 April 1929 | 16th Baroness Darcy de Knayth | Violet Herbert | Countess of Powis | Sackville Lane-Fox, father abeyant 1490-1903
 | Mervyn Herbert, son | 
| 28 August 1906 | 18 June 1917 | 14th Baroness Wentworth | Ada King-Milbanke |  | Ralph King-Milbanke, father | Anne Blunt, aunt | 
| 29 April 1907 | 4 May 1939 | 25th Baroness de Ros | Mary (FitzGerald-de Ros) Dawson | Countess of Dartrey | Dudley FitzGerald-de Ros, father | Una Ross, daughter abeyant 1939–1943
 | 
| 1908 | 28 August 1945 | 12th Lady Herries of Terregles | Gwendolen Fitzalan-Howard | Duchess of Norfolk | Marmaduke Constable-Maxwell, father | Bernard Fitzalan-Howard, son | 
| 16 January 1909 | 21 December 1919 | 2nd Baroness Amherst of Hackney | Mary Cecil | Lady William Cecil | William Tyssen-Amherst, father | William Alexander Evering Cecil, son | 
| 1 February 1909 | 28 May 1962 | The 2nd Baroness Burton | Nellie Lisa Bass |  | Michael Bass, 1st Baron Burton, father | Michael Baillie, 3rd Baron Burton, grandson | 
| 12 January 1912 | 26 February 1959 | 2nd Duchess of Fife | HH Princess Alexandra of Fife | HRH Princess Arthur of Connaught | Alexander Duff, father | James Carnegie, nephew | 
| 25 March 1913 | 24 December 1936 | 2nd Viscountess Wolseley | Frances Garnet Wolseley |  | Garnet Joseph Wolseley, father | Extinct | 
| 21 January 1914 | 18 August 1926 | 2nd Baroness Strathcona and Mount Royal | Margaret Howard |  | Donald Alexander Smith, father | Donald Sterling Palmer Howard, son | 
| 14 November 1914 | 9 October 1944 | 2nd Countess Roberts | Aileen Roberts |  | Frederick Roberts, father | Ada Lewin, sister | 
| 12 November 1915 | 30 September 1969 | 12th Countess of Seafield | Nina Studley-Herbert |  | James Ogilvie-Grant, father | Ian Ogilvie-Grant, son | 
| 18 June 1917 | 15 December 1917 | 15th Baroness Wentworth | Anne Blunt |  | Ada King-Milbanke, niece | Judith Blunt-Lytton, daughter | 
| 15 December 1917 | 8 August 1957 | 16th Baroness Wentworth | Judith Blunt-Lytton |  | Anne Blunt, mother | Noel Lytton, son | 
| 3 July 1918 | 20 July 1958 | 2nd Viscountess Rhondda | Margaret Mackworth |  | David Alfred Thomas, father | Extinct | 
| 17 May 1920 | 24 February 1960 | 12th Countess of Loudoun | Edith Abney-Hastings |  | Charles Clifton, uncle | Barbara Abney-Hastings, daughter | 
| 7 March 1921 | 23rd Baroness Botreaux 20th Baroness Hastings
 | Charles Rawdon-Hastings, uncle abeyant 1920-1921
 | Abeyant | 
| 7th Baroness Stanley | Ferdinando Stanley abeyant 1594-1921
 | 
| 23 February 1921 | 12 December 1974 | 14th Baroness Strange | Elizabeth Philipps | Viscountess St Davids | Jestyn Philipps, son | 
| 22nd Baroness Hungerford 21st Baroness de Moleyns
 | Charles Clifton, uncle abeyant 1920-1921
 | 
| 20 March 1925 | 9 February 1966 | 2nd Baroness Ravensdale | Irene Curzon, 2nd Baroness Ravensdale | Baroness Ravensdale of Kedleston created for life
 | George Curzon, father | Nicholas Mosley, nephew | 
| 1935 | 2 June 1975 | 10th Countess of Dysart | Wenefryde Scott |  | William Tollemache, uncle | Rosamund Greaves, daughter | 
| 24 January 1941 | 16 May 1978 | 23rd Countess of Erroll | Diana Hay (Moncreiffe) |  | Josslyn Hay, father | Merlin Hay, son | 
| March 1943 | 24 February 2008 | 18th Baroness Darcy de Knayth | Davina Ingrams |  | Mervyn Herbert, father | Caspar Ingrams, son | 
| 1943 | 9 October 1956 | 26th Baroness de Ros | Una Dawson Ross |  | Mary Dawson, mother | Georgiana Maxwell, granddaughter abeyant 1956–1958
 | 
| 17 October 1944 | 30 September 2012 | 12th Lady Kinloss | Mary Freeman-Grenville |  | Mary Morgan-Grenville, grandmother | Teresa Freeman-Grenville, daughter | 
| 9 October 1944 | 1955 | 3rd Countess Roberts | Ada Lewin |  | Aileen Roberts, sister | Extinct | 
| 16 April 1956 | 17 April 1982 | 11th Lady Ruthven of Freeland | Bridget (Hore-Ruthven) (Howard) Monckton | Countess of Carlisle by first marriage
 Viscountess Monckton of Brenchley
 by second marriage
 | Walter Hore-Ruthven, father | Charles Howard, son | 
| 1958 | 21 April 1983 | 27th Baroness de Ros | Georgiana Maxwell |  | Una Ross, grandmother abeyant 1956-1958
 | Peter Maxwell, son | 
| 24 February 1960 | 1 November 2002 | 13th Countess of Loudoun | Barbara (Huddleston) Abney-Hastings |  | Edith Abney-Hastings, mother | Michael Abney-Hastings, son | 
| 1 February 1963 | 9 December 2019 | 24th Countess of Sutherland | Elizabeth Sutherland |  | George Sutherland-Leveson-Gower, uncle | Alistair Charles St. Clair Sutherland, eldest son | 
| 30 December 1965 | 6 July 1995 | 20th Lady Sempill | Ann Forbes-Sempill |  | William Forbes-Sempill, father | James Chant-Sempill, son | 
| 26 May 1966 | 21 September 1974 | 11th Countess of Kintore | Ethel Sydney Keith-Falconer | Viscountess Stonehaven | Arthur George Keith-Falconer, brother | James Ian Baird, son | 
| 22 July 1969 | 4 May 1974 | 10th Baroness Wharton | Elisabeth Kemeys-Tynte |  | John Kemeys-Tynte, brother | Myrtle Robertson, daughter abeyant 1974–1990
 | 
| 1970 | 25 December 2012 | 27th Baroness Dacre | Rachel Douglas-Home |  | Thomas Brand, father abeyant 1965-1970
 | James Douglas-Home, son | 
| 22 April 1971 | 1990 | 2nd Baroness Portal of Hungerford | Rosemary Portal |  | Charles Portal, father | Extinct | 
| 19 April 1972 | 27 May 2002 | 14th Baroness Dudley | Barbara Hamilton |  | Ferdinando Dudley Henry Lea Smith, brother | Jim Anthony Hill Wallace, son | 
| 31 January 1975 | 25 November 2014 | 14th Lady Herries of Terregles | Anne Cowdrey | Baroness Cowdrey of Tonbridge | Bernard Fitzalan-Howard, father | Mary Mumford, sister | 
| 21 April 1975 |  | 31st Countess of Mar | Margaret (Lane) of Mar |  | James of Mar, father |  | 
| 1982 | 11 March 2005 | 16th Baroness Strange | Cherry Drummond of Megginch |  | John Drummond, father | Adam Drummond, son | 
| 29 March 1983 |  | 28th Baroness Willoughby de Eresby | Nancy Jane Marie Heathcote-Drummond-Willoughby |  | James Heathcote-Drummond-Willoughby, father |  | 
| 1975 | 2003 | 11th Countess of Dysart | Rosamund Greaves |  | Wenefryde Scott, mother | Katherine Grant, sister | 
| 27 August 1979 | 13 June 2017 | 2nd Countess Mountbatten of Burma | Patricia Knatchbull | Baroness Brabourne | Louis Mountbatten, father | Norton Knatchbull, son | 
| 31 August 1979 | 3 September 2024 | 21st Lady Saltoun | Flora Fraser |  | Alexander Fraser, father | Katharine Fraser, daughter | 
| 19 December 1985 |  | 8th Baroness Braye | Mary Penelope Verney-Cave |  |  |  | 
| 1990 | 15 May 2000 | 11th Baroness Wharton | Myrtle Robertson |  | Elisabeth Kemeys-Tynte, mother abeyant 1974–1990
 | Myles Robertson, son | 
| 30 June 1995 | 23 January 2023 | 16th Baroness Berners | Pamela Vivien Kirkham |  | Vera Ruby Williams, mother abeyant 1992-1995
 | Rupert Kirkham, son | 
| May 1999 |  | 11th Baroness Arlington | Jennifer Nelson Forwood |  | John FitzRoy, uncle abeyant 1936-1999
 |  |