| Alexander Charles Morrison | Director | 24 Oct 1991 | 6 May 2005 | British | 81 years |
| Alistair Fleming | Director | 9 Feb 1996 | 11 Apr 2001 | British | 81 years |
| Bruno Guilmette | Director | 1 Aug 2011 | 22 Sept 2011 | Canadian | 59 years |
| Carole Jean Cran | Director | 3 Jan 2018 | 8 Nov 2024 | British | 55 years |
| Charles Graham Hammond | Director | 24 Oct 1991 | 30 Jun 2024 | British | 64 years |
| Charles Graham Hammond | Secretary | 24 Oct 1991 | 22 Feb 1996 | British | - |
| Christopher Douglas Collins | Director | 1 Aug 2000 | 31 Dec 2009 | British | 85 years |
| Dave Duncan Struan Robertson | Director | 8 Sept 2003 | 2 Jun 2011 | British | 76 years |
| David Hedley Richardson | Director | 1 Jun 2005 | 2 Jun 2011 | British | 74 years |
| Diana Leigh Callebaut | Director | 10 Oct 2018 | 17 Jan 2020 | Australian | 45 years |
| Dominic James Helmsley | Director | 2 Jun 2011 | 1 Aug 2011 | British | 58 years |
| Ernest Gerald Freeman Brown | Director | 8 Sept 2003 | 2 Jun 2011 | British | 81 years |
| Gordon Arden Campbell | Director | 8 Jan 2003 | 3 Feb 2003 | British | 79 years |
| Graham Hodge Webster | Director | 26 Jul 1995 | 7 May 2004 | British | 85 years |
| Graham Peter Wilson Marr | Director | 22 Aug 2012 | 31 Dec 2017 | British | 67 years |
| Hugh Macrae Thompson | Director | 24 Oct 1991 | 10 May 2002 | British | 93 years |
| James Lane Tuckey | Director | 1 Jul 2007 | 2 Jun 2011 | British | 79 years |
| Jean-bastien Auger | Director | 1 Aug 2011 | 1 Jan 2017 | Canadian | 47 years |
| Jean-christophe Aubert | Director | 25 Sept 2023 | 10 Dec 2024 | Canadian | 33 years |
| John Alan Tothill | Secretary | 22 Feb 1996 | 15 Mar 2005 | British | - |
| Krish Gandy | Director | 1 May 2024 | 16 Sept 2024 | Australian | 40 years |
| Marie-louise Louise Clayton | Director | 1 Jan 2010 | 2 Jun 2011 | British | 65 years |
| Martine Legare | Director | 5 Jun 2020 | 25 Sept 2023 | Canadian | 56 years |
| Michael Andrew Bryan | Director | 4 Nov 2019 | 28 Dec 2021 | British | 56 years |
| Michael John Spencer Seymour | Director | 2 Jun 2011 | 31 Dec 2014 | British | 77 years |
| Morag Mcneill | Secretary | 15 Mar 2005 | 31 Aug 2012 | British | - |
| Neil Jonathan Krawitz | Director | 2 Jun 2011 | 20 Aug 2012 | British | 47 years |
| Nicola Catharine Palmer | Director | 2 Jun 2011 | 20 Aug 2012 | Australian | 57 years |
| Patrick Charbonneau | Director | 10 Oct 2018 | 6 Jul 2023 | Canadian | 47 years |
| Patrick Samson | Director | 1 Aug 2011 | 5 Jun 2020 | Canadian | 54 years |
| Perry Dean Glading | Director | 20 Jun 2001 | 31 Mar 2017 | British | 67 years |
| Peter Everett | Director | 18 Feb 1992 | 31 Aug 1998 | British | 94 years |
| Robert Haldane Smith (of Kelvin) | Director | 1 Jan 2015 | 24 Apr 2025 | British | 81 years |
| Russell Andrew Goodman | Director | 22 Sept 2011 | 14 Jun 2018 | Canadian | 72 years |
| Simon Daniel Beer | Director | 10 Oct 2018 | 31 Dec 2019 | British | 45 years |
| Simon Daniel Beer | Director | 25 Jan 2022 | 12 Dec 2023 | British | 45 years |
| Simon George Davy | Director | 10 Oct 2018 | 31 Jan 2025 | British | 55 years |
| Simon Philip Gray | Director | 2 Jun 2011 | 10 Oct 2018 | British | 58 years |
| Stefano Brugnolo | Director | 22 Apr 2016 | 10 Oct 2018 | Italian | 43 years |
| Stuart David Gray | Director | 2 Jun 2011 | 10 Oct 2018 | British | 52 years |
| Stuart Randall Paterson | Director | 15 Mar 2011 | 3 Jan 2018 | British | 67 years |
| Terence Patrick Smith | Director | 18 Feb 1992 | 3 May 2006 | British | 78 years |
| William Andrew Charles Thomson | Director | 18 Feb 1992 | 26 May 2000 | British | 77 years |
| William Harkness | Director | 16 Mar 1998 | 2 May 2007 | British | 82 years |
| William Wilson Murray | Director | 24 Oct 1991 | 6 May 2011 | British | 74 years |