| Adrian Harold Houston Bowden | Director | 8 Dec 1989 | 30 Jun 1990 | British | 87 years |
| Akira Suzuki | Director | 29 Aug 2013 | 29 May 2018 | Japanese | 66 years |
| Alan Brodie Henderson | Director | 14 Jul 1989 | 30 Jun 1990 | British | 92 years |
| Alexander David Maclellan | Director | 1 Dec 2000 | 24 May 2001 | British | 66 years |
| Andrew Arthur Laing | Director | 14 Jul 1989 | 1 Nov 2002 | British | 73 years |
| Andrew Arthur Laing | Director | 23 Jan 2004 | 14 Aug 2017 | British | 73 years |
| Angus Maitland Pelham Burn | Director | 14 Jul 1989 | 14 Jan 2000 | British | 94 years |
| Anita Margaret Frew | Director | 1 Oct 2004 | 30 Sept 2014 | British | 68 years |
| Anne Helen Richards | Director | 22 Mar 2011 | 12 Feb 2016 | British | 61 years |
| Anthony Frank Bushell | Director | 3 Apr 1992 | 18 Jan 2002 | British | 93 years |
| Beverly Hendry | Director | 12 Jun 1991 | 1 Nov 2002 | British | 72 years |
| Brett Marc Tollman | Director | 22 Sept 2020 | 28 Jul 2023 | South African | 50 years |
| Brian Malcolm Ross | Secretary | 13 Dec 1996 | 18 Jan 2002 | British | - |
| Carolyn Cathleen Raffaeli | Director | 1 Aug 2018 | 19 Dec 2019 | American | 69 years |
| Cecilia Reyes Leuzinger | Director | 1 Oct 2019 | 19 Dec 2019 | Swiss,filipino | 66 years |
| Charles Leonard Anthony Irby | Director | 1 Aug 1999 | 22 Jan 2009 | British | 80 years |
| Christopher David Fishwick | Director | 26 Oct 1995 | 14 Oct 2002 | British | 64 years |
| Christopher Giles Herron Weaver | Director | 1 Dec 2000 | 17 Jan 2013 | British | 79 years |
| Clive Mace Gilchrist | Director | 14 Jul 1989 | 23 Jul 1990 | British | 75 years |
| Clive Mace Gilchrist | Director | 10 May 1991 | 17 Jan 2003 | British | 75 years |
| David Ernest Woods | Director | 8 Sept 1997 | 23 Jan 2004 | British | 78 years |
| David Rene Pepin | Director | 2 Oct 1997 | 1 Aug 1999 | American | 83 years |
| Donald Henry Waters | Director | 1 Feb 2000 | 20 Jan 2011 | British | 88 years |
| Douglas Jardine Flint | Director | 1 Nov 2018 | 19 Dec 2019 | British | 70 years |
| Eric Kenelm Ford | Director | 27 Jul 1990 | 6 Jun 1991 | British | 76 years |
| Fiona Jean Mcgowan | Director | 22 Sept 2020 | 10 Nov 2023 | British | 60 years |
| Gary Robert Marshall | Director | 7 Dec 1999 | 1 Nov 2002 | British | 64 years |
| Geoffrey Charles Musson | Director | 14 Jul 1989 | 2 Apr 1991 | British | 83 years |
| George Alan Robb | Director | 14 Jul 1989 | 5 Mar 1993 | British | 83 years |
| Gerald Edgar Grimstone | Director | 14 Aug 2017 | 31 Dec 2018 | British | 76 years |
| Gerhard Wilhelm Fusenig | Director | 8 Oct 2009 | 7 Mar 2012 | German | 62 years |
| Gerhard Wilhelm Fusenig | Director | 25 Apr 2016 | 31 Dec 2018 | German | 62 years |
| Gordon Henderson | Director | 25 Feb 1999 | 24 May 2001 | British | 83 years |
| Harry Abraham Hyman | Director | 14 Jul 1989 | 27 Feb 1992 | British | 69 years |
| Hilary Anne Staples | Secretary | 12 Aug 2021 | 27 Jun 2025 | - | - |
| Hugh Young | Director | 12 Jun 1991 | 1 Nov 2002 | British | 67 years |
| Hugh Young | Director | 22 Mar 2011 | 14 Aug 2017 | British | 67 years |
| Iain Andrew Reid | Director | 5 Aug 2002 | 1 Nov 2002 | British | 79 years |
| James Legh Pope | Director | 27 Apr 1995 | 25 Feb 1999 | British | 76 years |
| James Neilson Pettigrew | Director | 23 Apr 2010 | 22 Apr 2016 | British | 67 years |
| Jennifer Ann Love | Secretary | 5 Jan 1990 | 13 Dec 1996 | British | - |
| John Devine | Director | 14 Aug 2017 | 19 Dec 2019 | British | 67 years |
| John Francis Solan Jr | Director | 1 Aug 1999 | 14 May 2004 | American | 86 years |
| John Leonard Wybrew | Director | 11 Oct 2001 | 24 Mar 2005 | British | 82 years |
| John Michael Brett | Secretary | 18 Jan 2002 | 12 Aug 2003 | British | - |
| John Plumpton | Director | 8 Sept 1997 | 18 Jan 2002 | British | 74 years |
| Jonathan Paul Asquith | Director | 1 Sept 2019 | 19 Dec 2019 | British | 69 years |
| Joseph Burnett-stuart | Director | 2 Dec 1991 | 14 Jan 2000 | British | 95 years |
| Julie Chakraverty | Director | 4 May 2011 | 29 May 2018 | British | 54 years |
| Jutta Grevinde Af Rosenborg | Director | 18 Jan 2013 | 19 Dec 2019 | Danish | 67 years |
| Katherine Lucy Garrett-cox | Director | 3 Dec 2001 | 1 Nov 2002 | British | 58 years |
| Kenichi Miyanaga | Director | 26 Nov 2009 | 29 Aug 2013 | Japanese | 65 years |
| Kenneth Arthur Gilmour | Secretary | 14 Aug 2017 | 30 Sept 2022 | - | - |
| Kevin Allen Huw Parry | Director | 14 Aug 2017 | 31 Dec 2018 | British | 63 years |
| Lynne Margaret Peacock | Director | 14 Aug 2017 | 29 May 2018 | British | 72 years |
| Malcolm Leslie Rifkind | Director | 1 Aug 2000 | 19 Jan 2012 | British | 79 years |
| Mark Hardiman | Director | 5 Apr 2023 | 27 Feb 2024 | British | 51 years |
| Martin James Gilbert | Director | N/A | 12 May 2020 | British | 70 years |
| Martinclair Pike | Director | 14 Aug 2017 | 19 Dec 2019 | British | 64 years |
| Melanie Gee | Director | 14 Aug 2017 | 19 Dec 2019 | British | 64 years |
| Michael Edward Haylon | Director | 27 May 2003 | 19 Nov 2004 | American | 68 years |
| Norman Haydn Reid | Director | 11 Oct 2001 | 23 Jan 2004 | British | 77 years |
| Norman Keith Skeoch | Director | 14 Aug 2017 | 1 Sept 2020 | British | 69 years |
| Norval Mackenzie Bryson | Director | 8 Sept 1997 | 19 Feb 1999 | British | 76 years |
| Partha Dasgupta | Director | 22 Mar 2011 | 6 May 2011 | British | 56 years |
| Patrick David Bartlett | Director | 22 Sept 2020 | 5 Apr 2023 | British | 58 years |
| Philip R Mcloughlin | Director | 29 Aug 1997 | 17 Jan 2003 | American | 79 years |
| Philip William Alexander Henderson | Director | 14 Jul 1989 | 15 Jan 1991 | British | 86 years |
| Richard Clark Shaw | Director | 16 May 1996 | 29 Aug 1997 | American | 77 years |
| Richard Clark Shaw | Director | 29 Aug 1997 | 31 Dec 1998 | American | 77 years |
| Richard Henry Booth | Director | 16 May 1996 | 14 Jan 2000 | American | 78 years |
| Richard Stephen Mully | Director | 23 Apr 2012 | 14 May 2019 | British | 64 years |
| Robert Cameron Birnie Reid | Director | 14 Jul 1989 | 30 Jun 1990 | British | 97 years |
| Robert Fiondella | Director | 1 Mar 2000 | 30 Aug 2001 | American | 83 years |
| Robert Gordon Wilson | Director | 14 May 2004 | 12 Jan 2005 | American | 92 years |
| Roderick Louis Paris | Director | 14 Aug 2017 | 22 Sept 2020 | British | 66 years |
| Roderick Macleod Macrae | Director | 1 Oct 2012 | 14 Aug 2017 | British | 61 years |
| Roger Courtenay Cornick | Director | 23 Jan 2004 | 30 Sept 2016 | British | 81 years |
| Ronald Scott Brown | Director | 14 Jul 1989 | 17 Jan 2003 | British | 88 years |
| Scott Edward Massie | Secretary | 12 Aug 2003 | 14 Aug 2017 | British | - |
| Simon Richard Vivian Troughton | Director | 29 Jul 2009 | 14 May 2019 | British | 72 years |
| Simon Y Tan | Director | 17 Jan 2003 | 27 May 2003 | Chinese | 73 years |
| Stephanie Jane Bruce | Director | 1 Jun 2019 | 22 Sept 2020 | British | 57 years |
| Susan Elizabeth Weston | Director | 1 Aug 2000 | 29 Nov 2002 | British | 68 years |
| Valerie Rahmani | Director | 3 Feb 2015 | 14 Aug 2017 | American,british | 68 years |
| William John Rattray | Director | 31 Jan 1991 | 31 May 2019 | British | 67 years |
| William John Rattray | Secretary | 14 Jul 1989 | 5 Jan 1990 | British | - |