| OXLEY, Gary Alex ACTIVE | Secretary | 15 Dec 2025 | | | | 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire, AL7 1BW |
| OHASHI, Keiji ACTIVE | Director | 01 Aug 2024 | | Japan | December 1969 | 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire, AL7 1BW |
| PALMER, Craige Lloyd Raymond ACTIVE | Director | 15 Jan 2026 | | England | September 1972 | 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire, AL7 1BW |
| STOKES, Timothy, Mr. ACTIVE | Director | 30 Sep 2012 | | United Kingdom | February 1966 | 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire, AL7 1BW |
| SINGH, Chanchal RESIGNED | Secretary | 01 Jul 2012 | 31 Oct 2019 | | | 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire, AL7 1BW |
| STOKES, Timothy RESIGNED | Secretary | 31 Oct 2019 | 06 Dec 2021 | | | 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire, AL7 1BW |
| TAYLOR, Paul RESIGNED | Secretary | 06 Dec 2021 | 17 Oct 2025 | | | 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire, AL7 1BW |
| TSUJIMURA, Atsushi RESIGNED | Secretary | 01 Apr 1997 | 01 Jul 2012 | | | 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire, AL7 1BW |
| TURNER, Michael Denis RESIGNED | Secretary | 01 Apr 1992 | 01 Apr 1997 | | | 111 Deakin Leas, Tonbridge, Kent, TN9 2JT |
| YOSHIDA, Kenji RESIGNED | Secretary | | 01 Apr 1992 | | | 54 Drayton Gardens, Winchmore Hill, London, N21 2NS |
| CAIN, James Corrin, Dr RESIGNED | Director | | 22 May 1996 | | April 1923 | 33 Farm Drive, Shirley, Croydon, Surrey, CR0 8HX |
| EGGL, Peter Johann, Dr. RESIGNED | Director | 05 Dec 2007 | 06 Dec 2021 | Germany | October 1953 | Arzbergerstra 10 D-82211, Herrsching, Germany |
| GRIFFITHS, John Hugh RESIGNED | Director | 09 Nov 1992 | 01 Dec 2010 | United Kingdom | February 1932 | 32 The Chantry, Hillingdon, Uxbridge, Middlesex, UB8 3RA |
| KOBAYASHI, Katsuhiro RESIGNED | Director | 21 Sep 2009 | 01 Dec 2014 | Japan | December 1959 | 325-6, Sunayama Cho, Hamamatsu City, Japan |
| MESTRE, Pierre RESIGNED | Director | 22 May 1996 | 02 Dec 2003 | | July 1921 | 8 Rue Du Salve, Trapu, Parc Du Moulin, De Massy 91882, FRANCE |
| SHIMAZU, Tadahiko RESIGNED | Director | 22 May 1996 | 21 Sep 2009 | | October 1947 | 325-6 Sunayama Cho, Hamamatsu City, Japan, FOREIGN |
| SKOGLUND, Max RESIGNED | Director | 06 Dec 2021 | 02 Jan 2026 | Sweden | July 1960 | Hamamatsu Photonics Europe Gmbh, Arzbergerstr. 10, Herrsching D82211, Germany |
| SKOGLUND, Max Ove Knut RESIGNED | Director | 02 Dec 2003 | 01 Dec 2014 | Sweden | July 1960 | Viplistergrand 31, Hasselby, Se-165 73, Sweden |
| TSUJIMURA, Atsushi RESIGNED | Director | 01 Dec 2014 | 01 Aug 2024 | Japan | August 1959 | 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire, AL7 1BW |
| TSUJIMURA, Atsushi RESIGNED | Director | 01 Dec 2003 | 30 Sep 2012 | England | August 1959 | 142 Westpole Avenue, Cockfosters, Hertfordshire, EN4 0AR |
| TURNER, Michael Denis RESIGNED | Director | 01 Apr 1992 | 22 May 1996 | | June 1952 | 111 Deakin Leas, Tonbridge, Kent, TN9 2JT |
| YOSHIDA, Kenji RESIGNED | Director | | 01 Apr 1992 | | December 1948 | 54 Drayton Gardens, Winchmore Hill, London, N21 2NS |