| MARSH, David Charles ACTIVE | Director | 18 Jul 2018 | | United Kingdom | November 1969 | Office 3a Capital Tower, 91 Waterloo Road, London, SE1 8RT, England |
| MIGNAT, Christian Marcel ACTIVE | Director | 10 Mar 2022 | | Germany | November 1984 | Office 3a Capital Tower, 91 Waterloo Road, London, SE1 8RT, England |
| TAYLOR, Kimberly ACTIVE | Director | 20 Nov 2020 | | United States | July 1974 | Office 3a Capital Tower, 91 Waterloo Road, London, SE1 8RT, England |
| DE TURRIS, Atillia Gabriella RESIGNED | Secretary | 29 Mar 1996 | 06 Feb 1998 | | | 8 Vineyard Mews, Preston Place, Richmond Upon Thames, Surrey, TW10 6DD |
| DONALD, Keith Malcolm Hamilton RESIGNED | Secretary | 17 Oct 1994 | 30 Nov 1995 | | | 251 Upper Richmond Road, London, SW15 6SW |
| EMMERSON, Mark Scott RESIGNED | Secretary | 04 Jun 2003 | 01 Oct 2014 | | | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| FLINT, Matthew James RESIGNED | Secretary | 01 Oct 2014 | 01 Mar 2025 | | | Carlton House, Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG, England |
| GOULDING, Graham Thomas RESIGNED | Secretary | 12 Jun 1998 | 25 Apr 2003 | | | 126 Auckland Road, London, SE19 2RP |
| PRICHARD, Teresa Joan RESIGNED | Secretary | 06 Feb 1998 | 12 Jun 1998 | | | 4 Bracken Gardens, Barnes, London, SW13 9HW |
| RICE, Stephen Euston RESIGNED | Secretary | | 17 Oct 1994 | | | 9 Martindale Walk, Brierley Hill, West Midlands, DY5 2RX |
| AHMED, Salim RESIGNED | Director | 01 Jun 2007 | 11 Jul 2007 | | July 1965 | The Firs, 341 St Albans Road West, Hatfield, Hertfordshire, AL10 9RN |
| CUBITT, Michael Harry RESIGNED | Director | 04 Nov 1997 | 17 Jun 1998 | | July 1948 | 22 Camellia Way, Simons Park, Wokingham, Berkshire, RG41 3NB |
| EMMERSON, Mark Scott RESIGNED | Director | 04 Jul 2002 | 01 Apr 2018 | England | July 1968 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| ETZWEILER, William David RESIGNED | Director | 17 Oct 1994 | 25 Oct 1996 | | December 1935 | 110 Pelham Drive, Camp Hill, Pennsylvania, 17011, Usa |
| FLINT, Matthew James RESIGNED | Director | 01 Oct 2014 | 01 Mar 2025 | England | April 1973 | Carlton House, Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG, England |
| GEERING, David Raymond RESIGNED | Director | 30 Mar 2009 | 31 Mar 2021 | England | January 1955 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| HATHAWAY, John Walter RESIGNED | Director | | 17 Oct 1994 | | June 1938 | Cherrydene Halfpenny Green, Bobbington, Stourbridge, West Midlands, DY7 5EN |
| HAWKER, Lawrence Philip RESIGNED | Director | 01 May 2001 | 13 Apr 2005 | | August 1955 | 18 Holden Way, Upminster, Essex, RM14 1BP |
| HEUSCHMID, Claus RESIGNED | Director | 20 Nov 2020 | 10 Mar 2022 | Germany | February 1972 | Carlton House, Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG, England |
| JACOBY, Scott William RESIGNED | Director | 30 Mar 2009 | 16 Aug 2016 | Usa | May 1966 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| KAYE, Joanne Carolyn RESIGNED | Director | 01 Dec 2020 | 30 Nov 2022 | United Kingdom | September 1973 | Carlton House, Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG, England |
| MAXWELL, Alexander Andrew RESIGNED | Director | 30 Sep 2005 | 30 Mar 2009 | England | February 1963 | The Granary, Old Home Farm Barns, High Street, Grateley, Andover, Hampshire, SP11 8QX |
| NEWMAN, George Robert RESIGNED | Director | | 25 Oct 1996 | | October 1946 | 105 Otter Trail, West Columbia, South Carolina, 29169, Usa |
| RANDALL, Bryce Ernest RESIGNED | Director | | 31 May 2007 | | February 1943 | Glenbrook House, Clayworth, Retford, Nottinghamshire, DN22 9AD |
| SCHON, Andre RESIGNED | Director | 21 Apr 2017 | 01 May 2017 | Switzerland | October 1959 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| SHAW, Robert John RESIGNED | Director | 10 Sep 2002 | 30 Sep 2005 | | September 1952 | 1b Battle Close, Lindholme, Doncaster, South Yorkshire, DN7 6DA |
| VAN AUDENAERDE, Hugo RESIGNED | Director | 18 Jul 2018 | 31 Mar 2021 | Belgium | August 1963 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| WARDLE, Alan RESIGNED | Director | 02 Sep 2004 | 01 Jul 2014 | United Kingdom | March 1956 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| WITHERS, Leslie Anthony RESIGNED | Director | 29 Jul 1992 | 31 Aug 2006 | | January 1949 | 9 The Balk, Glenfield, Leicester, Leicestershire, LE3 8BL |
| WORTLEY, Debbie RESIGNED | Director | 03 Aug 1992 | 19 Jul 2000 | | August 1959 | Holly House Grosvenor Avenue, Sutton In Ashfield, Nottinghamshire, NG17 1FG |