| FERGUSON, John ACTIVE | Director | 14 Apr 2020 | | United Kingdom | December 1981 | W. Sam White Building, Peterseat Drive, Altens, Aberdeen, AB12 3HT, United Kingdom |
| MARSH, Martin Graham ACTIVE | Director | 17 Oct 2025 | | United Kingdom | April 1977 | W. Sam White Building, Peterseat Drive, Altens, Aberdeen, AB12 3HT, Scotland |
| DEDMAN, David Francis RESIGNED | Secretary | 30 Jun 1995 | 10 Mar 2003 | | | Little Haven, 2 Trefoil Close, Hartley Wintney, Hampshire, RG27 8TS |
| JOYCE, Wendy Annette RESIGNED | Secretary | 02 Aug 2006 | 14 Apr 2020 | | | Nalco Limited PO BOX 11, Winnington Avenue, Northwich, Cheshire, CW8 4DX |
| LEE, Carl Richmond RESIGNED | Secretary | 30 Jun 2006 | 02 Aug 2006 | | | 63 Grove Park, Knutsford, Cheshire, WA16 8QE |
| LEE, Carl Richmond RESIGNED | Secretary | 10 Mar 2003 | 30 Apr 2004 | | | 63 Grove Park, Knutsford, Cheshire, WA16 8QE |
| RISINO, Anthony John, Dr RESIGNED | Secretary | 30 Apr 2004 | 30 Jun 2006 | | | 34 Holdford Moss, Sandymoor, Warrington, Cheshire, WA7 1XB |
| UPHILL, Terence Edwin RESIGNED | Secretary | | 30 Jun 1995 | | | Cherry Orchard 68 Hazlemere Road, Penn, High Wycombe, Buckinghamshire, HP10 8AG |
| BELL, Bradley RESIGNED | Director | 31 Dec 2003 | 01 Jun 2009 | | September 1952 | 28 Muirfield Circle, Wheaton, Du Page Illinois 60187, Usa |
| BILLETTE DE VILLEMEUR, Eric RESIGNED | Director | 28 Jun 2019 | 14 Apr 2020 | France | March 1985 | Winnington Avenue, Northwich, Cheshire, CW8 4DX, United Kingdom |
| BLACKBURN, Kenneth RESIGNED | Director | | 10 Mar 2003 | United Kingdom | October 1946 | Chiltern Gate, Crowell, Chinnor, Oxfordshire, OX9 4RR |
| BLAIR, David John RESIGNED | Director | 10 Mar 2003 | 31 Dec 2003 | | January 1954 | 3552 Stackinghay Drive, Naperville, Usa, IL60564 |
| COPE, John Arthur RESIGNED | Director | 10 Nov 1992 | 01 Jun 1995 | England | May 1950 | Thornwick Lodge Station Road, Bakewell, Derbyshire, DE45 1GA |
| CULLEN, Leslie Gray RESIGNED | Director | 06 Feb 1995 | 01 Jun 1995 | United Kingdom | January 1952 | 32 Grove Road, Beaconsfield, Buckinghamshire, HP9 1PE |
| DOBSON, John Teasdale RESIGNED | Director | | 10 Mar 2003 | United Kingdom | December 1947 | 27 Dukes Wood, Crowthorne, Berkshire, RG45 6NF |
| EVERY, Gareth RESIGNED | Director | 14 Apr 2020 | 01 Apr 2022 | United Kingdom | March 1953 | W. Sam White Building, Peterseat Drive, Altens, Aberdeen, AB12 3HT, United Kingdom |
| FIELD, Sally Ann RESIGNED | Director | 06 Feb 1995 | 01 Jun 1995 | | October 1947 | 20 Grosvenor Gardens, East Sheen, London, SW14 8BY |
| GAMBLE, John Denman RESIGNED | Director | 31 Mar 2014 | 28 Jun 2019 | United Kingdom | November 1962 | Winnington Avenue, Northwich, Cheshire, CW8 4DX, United Kingdom |
| HEY, Paul RESIGNED | Director | 28 Jun 2019 | 14 Apr 2020 | England | October 1964 | Winnington Avenue, Northwich, Cheshire, CW8 4DX, United Kingdom |
| JOHNSON, David RESIGNED | Director | 09 Feb 2009 | 15 Jul 2013 | | November 1960 | Nalco Limited PO BOX 11, Winnington Avenue, Northwich, Cheshire, CW8 4DX |
| JUNG, Frederic Alain Marie RESIGNED | Director | 25 Mar 2004 | 05 Dec 2008 | | May 1963 | 5247 N Magnolia Avenue, Chicago, Il 60640, FOREIGN, United States |
| KINSELLA, Roger James RESIGNED | Director | | 25 Feb 1994 | | May 1950 | Lindos 10 Dorset Road, Altrincham, Cheshire, WA14 4QN |
| LEE, Carl Richmond RESIGNED | Director | 30 Apr 2004 | 28 Jun 2019 | England | May 1963 | Nalco Limited PO BOX 11, Winnington Avenue, Northwich, Cheshire, CW8 4DX |
| LLOYD, John Eliot Fraser RESIGNED | Director | | 08 Feb 1995 | United Kingdom | January 1944 | Barton Oaks Calcot Park, Calcot, Reading, Berkshire, RG31 7RN |
| MALLEY, Paul RESIGNED | Director | 10 Mar 2003 | 07 May 2004 | England | September 1964 | 28 High Elm Road, Hale Barns, Cheshire, WA15 0HS |
| MCBRIDE, John Kristian Lars RESIGNED | Director | 15 Jul 1993 | 08 Feb 1995 | England | May 1954 | 61 Arthur Road, Wimbledon, London, SW19 7DN |
| MORLEY, Michael Harlow Fenton RESIGNED | Director | | 10 Nov 1992 | | June 1940 | The Manor House, Priston, Bath, Avon, BA2 9EH |
| RÖDSJÖ, Leif RESIGNED | Director | 14 Apr 2020 | 17 Oct 2025 | United Arab Emirates | December 1971 | Championx Gulf, Jebel Ali Freezone, Dubai, United Arab Emirates |
| SANDERS, Anthony Frederick RESIGNED | Director | | 30 Jun 1995 | | March 1948 | 21 Pool Drive, Bessacarr, Doncaster, South Yorkshire, DN4 6UX |
| SMITH, James RESIGNED | Director | 08 Aug 2009 | 31 Mar 2014 | Wales | April 1961 | 20, Broadoaks, Rossett, Wrexham, Clwyd, LL12 0FA |
| THIBAUDAT, Pierre RESIGNED | Director | 04 May 1999 | 01 Feb 2000 | | May 1945 | 19 Elvaston Place, London, SW7 5QF |
| UPHILL, Terence Edwin RESIGNED | Director | | 30 Jun 1995 | | September 1936 | Cherry Orchard 68 Hazlemere Road, Penn, High Wycombe, Buckinghamshire, HP10 8AG |
| WILLIAMSON, Leslie RESIGNED | Director | | 30 Jun 1995 | | October 1944 | 35 Lathbury Road, Woodridge Park, Brackley, Northamptonshire, NN13 6HW |