Continuing my list of Peers married at least four times. This is not an exclusive list.. it's just from the famileis on whom I have created files in which I can search. And again sorry.. I have not cross-checked with other peoples' lists for duplications.
Basil Feilding, 2nd Earl of Denbigh, d.28 Nov 1675; he was cr 1665 Baron St.Liz, with remainder, failing his own issue male, to that of his father; m.1st Lady Anne Weston (d.Venice 10 Mar 1635); m.2nd 12 Aug 1639 Barbara Lamb (d.1 Apr 1641 [per Cokayne; Collins says 2 Apr 1641]); m.3rd 8 Jul 1641 Lady Elizabeth Bourchier (1622-22 Sep 1670); m.4th Dorothy Lane (bur 23 Nov 1709)
Heneage Finch, 3rd Earl of Winchilsea, cr 1660 Baron Fitzherbert of Eastwell (1627/8-28 Aug 1689); m.1st London 21 May 1645 Hon. Diana Willoughby (bur 27 Mar 1648); m.2nd by 1649 Lady Mary Seymour (d.Eastwell 20 Nov 1672), by whom he is said to have had 7 sons and 4 daus; m.3rd London 10 Apr 1673 Catherine, Lady Wentworth, née Norcliff (dspm 1678); m.4th 1681 Elizabeth Ayres (d.10 Apr 1745)
James Hugh William Lowther, 7th Earl of Lonsdale (3 Nov 1922-23 May 2006); m.1st 18 Jun 1945 (div 1954) Tuppina Cecily Bennet (d.1984); m.2nd 9 Sep 1954 (div 1962) Hon Jennifer Lowther (below); m.3rd 6 Mar 1963 (div 1975) Nancy Ruth Cobbs (d.4 Jul 1999); m.4th 1975 Caroline Sheila (10 May 1943-8 Feb 2019), dau of Sir Gerald Ley, 3rd Bt.
JOHN GEORGE VANDERBILT HENRY, 11th Duke of Marlborough, etc (London 13 Apr 1926-16 Oct 2014); m.1st St. Margaret's, Westminster 19 Oct 1951 (div 1960) Susan Mary Hornby (19 Oct 1929-27 Jan 2005); m.2nd Paris 23 Oct 1961 (rel) Greek Orthodox Church of St.Etienne, Passy, Paris 23 Oct 1961 (div 1971) Athina Livanos (19 Mar 1926-Paris 10 Oct 1974); m.3rd Charlbury, Oxon 20 May 1972 (div 2008) Dagmar Gfn Douglas (b.Madrid 26 Sep 1943); m.4th 2008 Mrs Lily Mahtani
Edward Montagu, 2nd Earl of Manchester (1602-Whitehall 7 May 1671); m.1st 6 Feb 1623 Susanna Hill (d.Jan 1625); m.2nd Stoke Newington 1 Jul 1626 Lady Anne Rich (d.14 Feb 1642); m.3rd London 20 Dec 1642 Essex, Lady Bevill, née Cheke (d.Twickenham 28 Sep 1658); m.4th Eleanor, Dowager Countess of Warwick, née Wortley (d.London 20 Jan 1667); m.5th Lady Margaret Russell, Dowager Countess of Carlisle (d.Nov 1676)
ANGUS Charles Drogo Montagu, 12th Duke of Manchester, etc (Kimbolton 9 Oct 1938-25 Jul 2002); m.1st Geelong, Australia 22 Nov 1961 (div 1970) Mary Eveleen McClure; m.2nd 1971 (div 1985) Diane Pauline Plimsaul; m.3rd 1989 Anne-Louise Taylor; m.4th Swedish Church, Mayfair 22 Apr 2000 (div 2001) Biba Hiller (3 Feb 1942-11 Oct 2003)
Thomas Howard, cr 1553 Viscount Howard of Bindon (ca 1520-28 Jan 1582); m.1st Elizabeth Marney (ca 1517- ); m.2nd Gertrude Lyte; m.3rd Carshalton 7 Jun 1576 Mabel Burton; m.4th Margaret Manning (1559-1635)
Colin Lindsay, 3rd Earl of Balcarres (bap 23 Aug 1652-Balcarres 1722); m.1st ca 1670 Mauritia de Nassau [illegitimate granddaughter of Maurice, Pr of Orange] (ca 1637-bur 14 Aug 1671); m.2nd Lady Jean Carnegie (
d.ca 1680); m.3rd Lady Jean Kerr; m.4th by 4 Jul 1689 Lady Margaret Montgomerie (d.May 1747)
George Leslie, 4th Earl of Rothes, d.Dieppe 1558; m.1st by 1517 (div 1520) Margaret, nat. dau of 3rd Lord Crichton by Princess Margaret Stewart; m.2nd Elizabeth (d.1526 [1527?]), dau of Andrew, Lord Gray, and widow of Earl of Huntly and of Lord Glamis; m.3rd by 29 Jan 1530 Agnes (d.1541/3), dau of Sir John Somerville, and widow of Lord Fleming; m.4th by 10 Apr 1543 Isabel, dau of ___ Lundy, and widow of Earl of Crawford; he contracted to marry 5thly Christian, dau of ___ Wood, widow of George Strang
Spencer Douglas David Compton, 7th Marquess of Northampton, b.2 Apr 1946; m.1st 13 Jun 1967 (div 1973) Bss Henriette Luisa Maria Bentinck (1949-Seville 29 Nov 2010); m.2nd 1974 (div 1977) Annette Marie Smallwood; m.3rd 1977 (div 1983) Rosemary Ashley Morritt Hancock; m.4th 1985 (div 1988) Hannelore Ellen Erhardt; m.5th 1990 (div 2013) Mrs Pamela Martina Raphaella Kyprios, née Haworth; m.6th 4 Sep 2013 Tracy Goodman
William Francis Brinsley Trench, 8th Earl of Clancarty (18 Sep 1911-18 May 1995); m.1st 6 Jun 1940 (div 1947) Diana Joan Younger; m.2nd 16 Jun 1961 (div 1969) Wilma Dorothy Millen Vermilyea; m.3rd 1974 Mrs Mildred Allewyn Spong, née Bensusan (d.1975); m.4th 1976 Mary Agnes Radonicich (d.26 Dec 2003)
Bertrand Arthur William Russell, 3rd Earl Russell (Ravenscroft 18 May 1872-Penrhyndeudraeth 2 Feb 1970); m.1st London 13 Dec 1894 (div 1921) Alys Whitall Pearsall Smith (Philadelphia 18__-22 Jan 1951); m.2nd 27 Sep 1921 (div 1935) Dora Winifred Black (Thornton Heath, Surrey 3 Apr 1894-Porthcurno, Cornwall May 1986); m.3rd 18 Jan 1936 (div 1952) Patricia Helen Spence); m.4th 15 Dec 1952 Edith Finch (d.1 Jan 1978)
George Neville, 5th Lord Bergavenny, d.1535; m.1st Lady Joan FitzAlan; m.2nd Margaret Brent (dsps); m.3rd ca Jun 1519 Lady Mary Stafford; m.4th Mary Brooke, alias Cobham
Baptist Noel, 3rd Viscount Campden, etc. (1612-29 Oct 1682); m.1st 25 Dec 1632 Lady Anne Feilding (dsps 24 Mar 1636); m.2nd ca Jun 1638 Anne, Dowager Css of Bath, née Lovet; m.3rd 21 Dec 1639 Hon. Hester Wotton (bap 11 Jan 1616- ); m.4th 6 Jul 1655 Lady Elizabeth Bertie (d.1683)
Charles, 1798 NOEL, suc 1823 as 3rd Lord Barham, suc 1838 as 3rd Bt., cr 1841 Earl of Gainsborough, Viscount Campden of Campden, and Baron Noel of Ridlington (2 Oct 1781-10 Jun 1866); m.1st 1 Jul 1809 Elizabeth Welman (dsp 1 Dec 1811); m.2nd 13 May 1817 Elizabeth (d.20 Sep 1818), dau of Hon. Sir George Grey, Bt.; m.3rd 29 Jun 1820 Arabella (d.4 Oct 1829), dau of Sir James Hamlyn-Williams, 2nd Bt.; m.4th 25 Jul 1833 Lady Frances Jocelyn (20 Nov 1814-12 May 1885)
GEORGE John Charles, 8th Marquess of Lansdowne, etc (27 Nov 1912-Meikleour, Perthshire 25 Aug 1999); m.1st 18 Sep 1938 Barbara Chase (b.1918, died Perth Royal Infirmary 17 Feb 1965 after a shooting accident at Meikleour House); m.2nd 22 Dec 1969 (div 1978) Hon.Selina Eccles (18 Jan 1937-Amsterdam 11 May 2019); m.3rd Meikleour House 15 Oct 1978 Gillian Anna Morgan (1936-1982); m.4th in Scotland 12 Jul 1995 Penelope Eva Bradford (Hon. Mrs Astor, d.31 Dec 2006)
Edward John Stanley, 6th Lord Sheffield & Stanley of Alderley, etc. (9 Oct 1907-3 Mar 1971); m.1st 3 Mar 1932 (div 1936) Lady Victoria Audrey Beatrice Chetwynd-Talbot (13 Mar 1910- ); m.2nd 18 Jan 1944 (div 1948) Edith Louisa Sylvia Hawkes; m.3rd 6 Apr 1951 (div 1957) Thérèse Husson; m.4th 15 Sep 1961 Kathleen Margaret Wright (d.1 Apr 1996)
IAN Douglas Campbell, 11th Duke of Argyll, etc (Paris 18 Jun 1903-Edinburgh 7 Apr 1973); m.1st 12 Dec 1927 (div 1934) Hon. Janet Gladys Aitken (9 Jul 1908-1988); m.2nd Caxton Hall, London 22 Nov 1935 (div 1951) Louise Hollingsworth Morris Clews (d.10 Feb 1970); m.3rd Caxton Hall Register Office 22 Mar 1951 (div 1963) Mrs Ethel Margaret Sweeny, née Whigham (The Broom, Newton Mearns, Renfrewshire 1 Dec 1912-Pimlico 25 Jul 1993); m.4th 15 Jun 1963 Mathilda Coster Mortimer (Geneva 20 Aug 1925-American Hosital, Paris 6 Jun 1997)
Garret Graham Wellesley, 7th Earl Cowley (30 Jun 1934-17 Jun 2016); m.1st 1960 (div 1966) Elizabeth Suzanne Lennon; m.2nd 1968 (div 1981) Isabelle O’Bready; m.3rd 1981 Paige Deming (d.Isle of Man 31 Dec 2008); m.4th London 15 Feb 2012 Mrs Carola Marion Stormonth Darling, née Erskine-Hill (b.1943)
Alexander Sutherland, cr 1650 Lord Duffus (1621/2-31 Aug 1674); m.1st by 1644 Jean (dsps 31 Mar 1648), dau of Colin Mackenzie, Earl of Seaforth, and widow of John Sinclair, Master of Berriedale; m.2nd 13 Jan 1653 Jean Innes (dsp 10 Mar 1653); m.3rd 1654 Lady Margaret Stewart (d.Jan 1667); m.4th ca 1668 Hon. Margaret Forbes (d.13 Apr 1677)
Alexander Seton, cr 1651 Viscount of Kingston (1621-Whittinghame 21 Oct 1691); m.1st Jean Fletcher; m.2nd ca 1661 Elizabeth Douglas (d.1668), heiress of Whittinghame; m.3rd Hon. Elizabeth Hamilton; m.4th Edinburgh 3 Aug 1686 Lady Margaret Douglas (Sep 1651-Whittinghame 12 Oct 1692)
EDWARD Fitzgerald, 7th Duke of Leinster, etc (6 May 1892-committed suicide 8 Mar 1976); m.1st London 12 Jun 1913 (div 1930) May Etheridge (d.11 Feb 1935); m.2nd 1 Dec 1932 (div 1946) Raffaella Kennedy (d.London 28 Dec 1993); m.3rd 11 Mar 1946 Jessie Smither (d.1960); m.4th 1965 Vivien Irene Felton (19 Feb 1920-Brighton 1992)
James Berkeley, summoned 1421 as Baron Berkeley [it is not clear whether it was believed that he was entitled to the 1295 Barony as heir of entail, or that this was a Barony by Tenure as owner of Berkeley Castle, but by modern doctrine it is considered a new barony] (Raglan ca 1394-Berkleley Castle Nov 1463); m.1st a dau of Sir John St.John; m.2nd 1415 a dau of Sir Humphrey Stafford; m.3rd 1423/4 Isabel (d.27 Sep 1452), widow of William Ferrers, dau of Thomas de Mowbray, Duke of Norfolk; m.4th 1457 Joan, dau of John Talbot, Earl of Shrewsbury
John Clinton, 3rd Lord Clinton (d.6 Sep 1398); m.1st ca 1350 Idoine de Say; m.2nd NN; m.3rd Joan, Lady Limbury; m.4th Elizabeth, widowed Lady Grey and Lady Bermingham, née de la Plaunche (d.1423)
Sir Robert Dalzell, 3rd Bt., 1702 5th Earl of Carnwath, attainted 1716 (ca 1687-Kirkmichael 4 Aug 1737); m.19 Jan 1710 Lady Grace Montgomerie (d.Jan 1713); m.2nd 3 Jun 1720 Grizell Urquhart (bur 4 Sep 1723); m.3rd 15 Nov 1728 Margaret Hamilton (d.Edinburgh 13 Feb 1730); m.4th Worksop 19 Jun 1735 Margaret Vincent (bap 5 Nov 1696-London 11 Apr 1758)
HUGH Richard Arthur Grosvenor, 2nd Duke of Westminster, etc (Saighton Towers 19 Mar 1879-Loch More Lodge 20 Jul 1953); m.1st London 16 Feb 1901 (div 1919) Constance Edwina Cornwallis-West (1876-Brockenhurst, Hants 21 Jan 1970); m.2nd 26 Nov 1920 (div 1926) Violet Mary Nelson (1891-1983); m.3rd Register Office, Prince's Row, Westminster 20 Feb 1930 (div 1947) Hon Loelia Mary Ponsonby (6 Feb 1902-London 1 Nov 1993); m.4th Chester 7 Feb 1947 Anne Winifred Sullivan (13 Apr 1915-31 Aug 2003)
Edward Henry Harold Ward, 7th Viscount Bangor (5 Nov 1905-1993); m.1st 29 Apr 1933 (div 1937) Elizabeth Balfour; m.2nd 14 Aug 1937 (div 1947) May Kathleen Middleton (d.9 May 1969); m.3rd 12 Nov 1947 (div 1951) Leila Mary Heaton (d.23 Feb 1959); m.4th 1951 Marjorie Alice Banks (d.1991)
Algernon George de Vere Capell, 8th Earl of Essex (London 21 Feb 1884-8 Dec 1966); m.1st Cirencester 28 Sep 1905 (div 1926) Mary Eveline Stewart Freeman (d.30 Oct 1955); m.2nd 10 Feb 1926 (div 1950) Alys Montgomery Falkiner; m.3rd 10 Dec 1950 (div 1956) Mildred Carlson; m.4th 1957 Christine Mary Davis (d.1985)
George William Coventry, 11th Earl of Coventry (25 Jan 1934-Malaga 14 Jun 2002); m.1st 22 Mar 1955 (div 1963) Marie (Mimi) Farquhar-Medart (d.1998); m.2nd 5 Dec 1969 (div 1975) Ann Cripps; m.3rd 1980 (div 1988) Valerie Anne Birch; m.4th 1992 Rachel Wynne Mason
John Darcy, 3rd Lord Darcy, d.5 Jul 1635; m.1st Rosamond Frescheville (bap 5 Jun 1576-18 Apr 1607); m.2nd 7 May 1617 Isabel Wray (dsp 27 Jan 1622); m.3rd 7 Nov 1624 Hon. Mary Belasyse (bap 11 Apr 1606-14 Sep 1625); m.4th Elizabeth West (bur 24 Jul 1669)
Conyers Darcy, 2nd Earl of Holderness (bap 3 Mar 1622-13 Dec 1692); m.1st 14 May 1645 Lady Catherine Fane (bur 30 Aug 1649); m.2nd 8 Feb 1650 Lady Frances Howard (d.9 Apr 1670); m.3rd shortly before summer 1676 Frances (bur 5 Jan 1681), dau of William Seymour, 2nd Duke of Somerset, and widow of the Earl of Southampton and of Viscount Molyneux; m.4th 8 Jan 1685 Mrs Elizabeth Warwick (1 Jan 1635-22 Feb 1690), dau of Lord Frescheville
James Darcy, cr 1721 Baron Darcy of Navan [I]; he d.19 Jul 1731; m.1st Bethia Payler (d.19 Nov 1671); m.2nd Hon. Anne Stawell; m.3rd ca 1693 Mary (d.1710), dau of Sir William Hickes, 2nd Bt.; m.4th 6 Apr 1725 Margaret Garth (d.9 Aug 1758)
Bennet Sherard, 3rd Earl of Harborough (bap 3 Sep 1709-23 Feb 1770); m.1st 28 Jun 1748 Lady Elizabeth Verney (dsps 7 Jun 1756); m.2nd 2 Jul 1757 Frances Noel (d.15 Dec 1760); m.3rd 31 Mar 1761 Margaret Hill (7 Jul 1729-21 Feb 1767), sister of Lord Berwick; m.4th 8 Oct 1767 Elizabeth (bap 3 Mar 1740-5 Mar 1797), dau of Sir Thomas Cave, 5th Bt.