| FIELD, Joanna Maria ACTIVE | Secretary | 02 Aug 2024 | | | | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| HARRIS, James Huw Keir ACTIVE | Director | 01 Mar 2018 | | United Kingdom | June 1968 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| ROUD, Edwin George ACTIVE | Director | 31 Mar 2016 | | United Kingdom | September 1963 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| TRAVERS, Catherine Helen ACTIVE | Director | 01 Jan 2022 | | England | October 1964 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| DESSON, William Gregor RESIGNED | Secretary | 01 Dec 1994 | 15 Mar 1996 | | | Torridon, Linersh Wood Bramley, Guildford, Surrey, GU5 0EF |
| FIELD, Joanna Maria RESIGNED | Secretary | 27 Jan 2015 | 31 Mar 2017 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| GREGORY, Philip Charles RESIGNED | Secretary | 15 Mar 1996 | 31 May 2014 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| GRIGOR, Martin James RESIGNED | Secretary | | 01 Dec 1994 | | | 7 Cherry Tree Avenue, Stapleford, Cambridge, Cambridgeshire, CB2 5BW |
| LYNN, Marjorie Eva RESIGNED | Secretary | 31 May 2014 | 27 Jan 2015 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| PORTER, John Charles Anthony RESIGNED | Secretary | 01 Aug 2022 | 15 Jun 2023 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| STANBOROUGH, Danielle Elizabeth RESIGNED | Secretary | 31 Mar 2017 | 12 Jan 2018 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| ZIVKO, Diana RESIGNED | Secretary | 16 Jun 2023 | 02 Aug 2024 | | | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| ZIVKO, Diana RESIGNED | Secretary | 12 Jan 2018 | 31 Jul 2022 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| BERESFORD, Robert RESIGNED | Director | | 20 Nov 1998 | | November 1938 | Cherrywood Nethern Court Road, Woldingham, Caterham, Surrey, CR3 7EF |
| BLACKBURN, Michael Orlando RESIGNED | Director | 23 Sep 1999 | 18 Oct 2007 | | October 1945 | 7 More Close, Purley, Surrey, CR8 2JN |
| BOWER OBE, Denise Ann, Professor RESIGNED | Director | 01 Jan 2022 | 31 Dec 2023 | England | October 1968 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| CHESWORTH, Peter Michael RESIGNED | Director | | 05 Aug 2005 | | June 1945 | The Barn Shepreth Road, Barrington, Cambridge, CB2 5SB |
| DIXON, Kevin Paul RESIGNED | Director | 29 Nov 2007 | 31 Mar 2016 | United Kingdom | June 1953 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| ELLIOTT, Ian Haslett RESIGNED | Director | | 30 Apr 1992 | | December 1940 | Woodlands 2 Green Lane, Purley, Surrey, CR8 3PG |
| FOX, Robin Bretten RESIGNED | Director | | 10 May 2002 | | November 1943 | 6 Church Street, Little Shelford, Cambridge, Cambridgeshire, CB2 5HG |
| FRAME, Martin Stevenson Crosbie RESIGNED | Director | 14 May 2002 | 29 Apr 2005 | England | April 1945 | 23 St Jamess Gardens, Holland Park, London, W11 4RE |
| GALBRAITH, Ian Martin Richard RESIGNED | Director | 01 Mar 2018 | 30 Sep 2025 | England | July 1963 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| GEORGE, Michael Edwin RESIGNED | Director | | 30 Apr 1992 | | April 1943 | 36 High Street, Great Wilbraham, Cambridge, Cambridgeshire, CB1 5JD |
| HAIGH, Michael David RESIGNED | Director | 27 Nov 2015 | 31 Jul 2022 | United Kingdom | June 1960 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| HAYWARD, John Desmond RESIGNED | Director | | 30 Apr 1992 | | May 1940 | 49 Upfield, Croydon, Surrey, CR0 5DR |
| HOWELLS, Keith John, Mr. RESIGNED | Director | 16 Dec 2003 | 30 Jun 2019 | England | June 1953 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| JACKSON, Brian Kenneth RESIGNED | Director | | 30 Apr 1992 | | March 1938 | 3 Bensteads End, Angle End Great Wilbraham, Cambridge, Cambridgeshire, CB1 5JS |
| KHAN, Masood Husain RESIGNED | Director | 08 Apr 1994 | 31 Mar 1996 | | August 1936 | 22 Bandon Road, Girton, Cambridge, Cambridgeshire, CB3 0LU |
| KHAN, Masood Husain RESIGNED | Director | | 30 Apr 1992 | | August 1936 | 22 Bandon Road, Girton, Cambridge, Cambridgeshire, CB3 0LU |
| LAMB, Peter John RESIGNED | Director | | 30 Apr 1992 | | December 1938 | 4 St Johns Close, East Grinstead, Sussex, RH19 3YR |
| LEE, Peter Stuart RESIGNED | Director | 08 Apr 1994 | 01 Aug 2000 | | January 1945 | Grove House 8 Newmarket Road, Stretham, Cambridge, Cambridgeshire, CB6 3JZ |
| LEE, Peter Stuart RESIGNED | Director | | 30 Apr 1992 | | January 1945 | Grove House 8 Newmarket Road, Stretham, Cambridge, Cambridgeshire, CB6 3JZ |
| LEONARD, Guy William Ingledew, Mr. RESIGNED | Director | 29 Nov 2007 | 31 Dec 2020 | England | November 1955 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| MASTERS, Reginald Thomas RESIGNED | Director | | 30 Apr 1992 | | November 1932 | 12 The Greenways, Paddock Wood, Tonbridge, Kent, TN12 6LS |
| PALMER, David Ernest RESIGNED | Director | 08 Apr 1994 | 20 Aug 1995 | | August 1935 | Nordwic, Woodlands Road, Bickley, Kent, BR1 2AR |
| PALMER, David Ernest RESIGNED | Director | 13 Apr 1993 | 23 Apr 1993 | | August 1935 | Nordwic, Woodlands Road, Bickley, Kent, BR1 2AR |
| RANKIN, William James RESIGNED | Director | 26 Jan 2007 | 30 Jun 2010 | England | June 1949 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| ROBSON, John Frederick RESIGNED | Director | | 30 Apr 1992 | | June 1932 | St Johns Farmhouse, High Street Girton, Cambridge, Cambridgeshire, CB3 0QL |
| STOVELL, Kevin John RESIGNED | Director | 11 Dec 2002 | 27 Nov 2015 | United Kingdom | July 1952 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| THIRLWALL, Timothy John RESIGNED | Director | | 04 Dec 2003 | England | December 1943 | The Willows 24 Grimwade Avenue, Croydon, Surrey, CR0 5DG |
| TWIGG, Robert Douglas Hilton RESIGNED | Director | 01 Aug 2000 | 30 Nov 2002 | England | July 1944 | Seafield 16 Mount Boone, Dartmouth, Devon, TQ6 9PB |
| TWIGG, Robert Douglas Hilton RESIGNED | Director | | 30 Apr 1992 | | July 1944 | 53 High Street, Harlton, Cambridge, Cambridgeshire, CB3 7ES |
| WHITEFIELD, John Macarthur RESIGNED | Director | | 30 Apr 1992 | | May 1932 | Flat 401 Block B Villa Verde, 14 Guildford Road, FOREIGN, Hong Kong |
| WICKENS, Peter John RESIGNED | Director | 29 Jul 2005 | 31 Dec 2010 | England | January 1950 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| WILLIAMS, Richard RESIGNED | Director | 29 Nov 2007 | 31 Mar 2015 | England | February 1955 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |