| Dates | Officers | Assessors |
| 2017-2021 | President: Mike Osborne (USA) President Elect: Marcos Cueto (Brazil) First Vice-President: Angela Creager (USA) Second Vice-President: Luiz Carlos Soares (Brazil) Secretary General: Catherine Jami (France) Treasurer: Milada Sekyrkova (Czech Republic) Assistant Secretary General: Takehiko Hashimoto (Japan) |
Gregory Good (USA) Gavan McCarthy (Australia) Krishnamurthi Ramasubramanian (India) Maria Rentetzi (Greece) Sergey Shalimov (Russia) Liba Taub (UK) |
| 2013-2017 | President: Efthymios Nicolaidis (Greece) President Elect: Mike Osborne (USA) First Vice-President: Lesley Cormack (Canada) Second Vice-President: Jean Gayon (France) Secretary General: Catherine Jami (France) Treasurer: Jeffrey Hughes (UK) Assistant Secretary General: Annette Vogt (Germany) |
Takehiko Hashimoto (Japan) Frank James (UK) Maija Kallinen (Finland) Krishnamurthi Ramasubramanian (India) Luiz Carlos Soares (Brazil) Sun Xiaochun (China) |
| 2009-2013 | President: Liu Dun (China) Past President: Ronald Numbers (USA) First Vice-President: Paolo Brenni (Italy) Second Vice-President: Mike Osborne (USA) Secretary General: Efthymios Nicolaidis (Greece) Treasurer: Catherine Jami (France) Assistant Secretary General: Karine Chemla (France) |
Ana Rosa Barahona Echeverria (Mexico) Frank James (UK) Alexey Postnikov (Russia) Pablo Lorenzano (Argentina) Annette Vogt (Germany) Michio Yano (Japan) |
| 2005-2009 | President: Ronald Numbers (USA) Past President: Ekmeleddin Ihsanoglu (Turkey) First Vice-President: Liu Dun (China) Second Vice-President: Fabio Bevilacqua (Italy) Secretary General: Efthymios Nicolaidis (Greece) Treasurer: Ida Stamhuis (Netherlands) Assistant Secretary General: Eva Vamos (Hungary) |
Lesley Cormack (Canada) Ubiratan d’Ambrosio (Brazil) Mahmoud Hafez (Egypt) Catherine Jami (France) Alexey Postnikov (Russia) Michio Yano (Japan) |
| 2001-2005 | President: Ekmeleddin Ihsanoglu (Turkey) Past President: Bidare Venk Subbarayappa (India) First Vice-President: Vladimir Kirsanov (Russia) Second Vice-President: Liu Dun (China) Secretary General: Juan-José Saldaña (Mexico) Treasurer: Efthymios Nicolaidis (Greece) Assistant Secretary General: Fabio Bevilacqua (Italy) |
Kirsti Andersen (Denmark) Mohammed Bagheri (Iran) Roman Duda (Poland) Carlos Galles (Argentina) Mahmoud Hafez (Egypt) Chikara Sasaki (Japan) |
| 1997-2001 | President: Bidare Venk Subbarayappa (India) Past President: Robert Fox (UK) First Vice-President: Mirko Grmek (France) Second Vice-President: Ekmeleddin Ihsanoglu (Turkey) Secretary General: Robert Halleux (Belgium) Treasurer: Liba Taub (UK) Assistant Secretary General: Fabio Bevilacqua (Italy) |
Mohammed Bagheri (Iran) Roman Duda (Poland) Carlos Galles (Argentina) Vladimir Kirsanov (Russia) Mahmoud Hafez (Egypt) Chikara Sasaki (Japan) |
| 1993-1997 | President: Robert Fox (UK) Past President: William Shea (Canada) First Vice-President: Rafaella Simili (Italy) Second Vice-President: Mary-Jo Nye (USA) Secretary General: Robert Halleux (Belgium) Treasurer: David King (Germany) Assistant Secretary General: Helge Kragh (Denmark) |
S.M.R. Ansari (India) Mohammed Bagheri (Iran) Chen Meidong (China) Ubiratan D’Ambrosio (Brazil) Shuntaro Ito (Japan) Vassili Kirsanov (Russia) Juan Jose Saldaña (Mexico) |
| 1990-1993 | President: William Shea (Canada) Past President: Paolo Galluzzi (Italy) First Vice-President: Robert Fox (UK) Second Vice-President: Hans Wussing (Germany) Secretary General: Tore Frängsmyrb (Sweden) Treasurer: David King (Germany) Assistant Secretary General: Mario Hormigon (Spain) |
S.M.R. Ansari (India) Shuntaro Ito (Japan) Tsun Ko (China) Mary-Jo Nye (USA) Juan Jose Saldaña (Mexico) N. Ustinov (USSR) |
| 1986-1989 | President: Paolo Galluzzi (Italy) Past President: Erwin Hiebert (USA) First Vice-President: S.R. Mikulinsky (USSR) Second Vice-President: Christoph Scriba (FRG) Secretary General: William Shea (Canada) Treasurer: Julio Samso (Spain) Assistant Secretary General: Hans Wussing (GDR) |
Pierre Dugac (France) Li Peishan (China) Bidare Venk Subbarayappa (India) |
| 1982-1985 | President: Erwin Hiebert (USA) Past President: A.T. Grigorian (USSR) First Vice-President: Olaf Pedersen (Denmark) Second Vice-President: Eric G. Forbes, Christoph Scriba (FRG) Secretary General: William Shea (Canada) Treasurer: Julio Samso (Spain) Assistant Secretary General: Hans Wussing (GDR) |
Stefan Balan (Romania) Bidare Venk Subbarayappa (India) |
| 1978-1981 | President: A.T. Grigorian (USSR) Past President: René Taton (France) First Vice-President: Erwin Hiebert (USA) Second Vice-President: Maria Luisa Righini Bonelli (Italy) Secretary General: Eric G. Forbes (UK) Treasurer: Olaf Pedersen (Denmark) Assistant Secretary General: Ahmad Yousef Al-Hassan (Syria) |
Stefan Balan (Romania) Frank Greenaway (UK) |
| 1975-1977 | President: René Taton (France) Past President: Joseph Needham (UK) First Vice-President: A.T. Grigorian (USSR) Second Vice-President: Erwin Hiebert (USA) Secretary General: Frank Greenaway (UK) Treasurer: Olaf Pedersen (Denmark) |
Bogdan Suchodolski (Poland) Masao Watanabe (Japan) |
| 1972-1974 | President: Joseph Needham (UK) First Vice-President: A.T. Grigorian (USSR) Second Vice-President: René Taton (France) Secretary General: Frank Greenaway (UK) Treasurer: Olaf Pedersen (Denmark) |
Eugeniusz Olszewski (Poland) Masao Watanabe (Japan) |
| 1969-1971 | President: I. Bernard Cohen (USA) First Vice-President: Boris Kedrov (USSR) Second Vice-President: Luigi Belloni Secretary General: René Taton (France) Treasurer: Dirk Arnold Wittop Koning (Netherlands) Assistant Secretary General: J. Smolka |
Eugeniusz Olszewski (Poland) Joseph Needham (UK) |
| 1965-1968 | President: Vasco Ronchi (Italy) First Vice-President: I. Bernard Cohen (USA) Second Vice-President: A.T. Grigorian (USSR) Secretary General: René Taton (France) Treasurer: Dirk Arnold Wittop Koning (Netherlands) |
Bogdan Suchodolski (Poland) William D.M. Paton (UK) |
| 1962-1965 | President: Vasco Ronchi (Italy) First Vice-President: I. Bernard Cohen (USA) Second Vice-President: A.T. Grigorian (USSR) Secretary General: René Taton (France) Treasurer: Dirk Arnold Wittop Koning (Netherlands) Assistant Secretary General: Rosemarie Ferenczi (France) |
Akira Kobori (Japan) William D.M. Paton (UK) |
| 1959-1962 | President: Vasco Ronchi (Italy) First Vice-President: Richard Shryock (USA) Second Vice-President: Josep Maria Millàs Vallicrosa (Spain) Secretary General: René Taton (France) Treasurer: Dirk Arnold Wittop Koning (Netherlands) Assistant Secretary General: Rosemarie Ferenczi (France) |
A.N. Figurovsky (USSR) Willy Hartner (FRG) |
| 1956-1959 | President: R.J. Forbes (Netherlands) First Vice-President: W.H. Schopfer (Switzerland) Second Vice-President Vasco Ronchi (Italy) Secretary General: René Taton (France) Treasurer: Dirk Arnold Wittop Koning (Netherlands) Assistant Secretary General: |
Frederic Simon Bodenheimer (Israel) Richard Shryock (USA) |
| 1953-1956 | President: Louis de Broglie (France) First Vice-President: W.H. Schopfer (Switzerland) Second Vice-President H. Dingle (UK) Secretary General: Petre Sergescu (Romania), René Taton (France) Treasurer: Dirk Arnold Wittop Koning (Netherlands) |
René Taton (France) G. Ucelli (Italy) |
| 1950-1953 | President: George Sarton (USA) First Vice-President: Dorothea Waley-Singer (UK) Second Vice-President R.J. Forbes (Netherlands) Secretary General: Petre Sergescu (Romania) Treasurer: Johan Adriaan Vollgraff (Netherlands) |
Jean Pelseneer (Belgium) René Taton (France) |
| 1947-1950 | President: Charles Singer (UK) First Vice-President: A. Reymond (Switzerland) Second Vice-President George Sarton (USA) Secretary General: Petre Sergescu (Romania) Treasurer: Johan Adriaan Vollgraff (Netherlands) Assistant Secretary General: Pierre Brunet (France) |
S. Lilley (UK) Jean Pelseneer (Belgium) |
