| Board No | Date | Location | President | Past-President | Vice-President | Secretary General | Treasurer | Executive Members |
|---|---|---|---|---|---|---|---|---|
| 33 | August 2019 | Oslo, Norway | LS Shashidhara | Hiroyuki Takeda | Le Kang | Alexey Kotov | Santiago Merino | +6 Executive Members |
| 32 | December 2015 | Berlin, Germany | Hiroyuki Takeda | Nils Chr. Stenseth | Regine Jahn | L S Shashidhara | Santigo Merino | +4 Executive Members |
| 31 | July 2012 | Suzhou, China | Nils Chr. Stenseth | -- | Yury Dgebuadze, Zhibin Zhang | Hiroyuki Takeda | Santigo Merino | +6 Executive Members |
| 30 | October 2009 | Cape Town, South Africa | Giorgio Bernardi | John Buckeridge | John Jungck, Zhibin Zhang | Jean-Marc Jallon | Annelies Pierrot-Bults | +12 Executive Members |
| 29 | May 2007 | Washington DC, USA | John Buckeridge | Motonori Hoshi | Giorgio Bernardi, Jean-Marc Jallon | Christoph Scheidegger | Erwin Beck | +13 Executive Members |
| 28 | January 2004 | Cairo, Egypt | Motonori Hoshi | Marvalee H. Wake | Braulio Ferreria de Souza Dias, Subhash C. Lakhotia | Christoph Scheidegger | Erwin Beck | +12 Executive Members |
| 27 | November 2000 | Naples, Italy | Marvalee H. Wake | Jean-Claude Mounolou | Motonori Hoshi, José Galizía Tundisi | Peter Whittaker / Giorgio Bernardi | Osmo O.P. Hänninen | +14 Executive Members |
| 26 | Nov. 1997 | Taipei, Taiwan | Jean-Claude Mounolou | David L. Hawksworth | Chang-Hung Chou, José Galizía Tundisi | Marvalee H. Wake | Osmo O.P. Hänninen | +14 Executive Members |
| 25 | Sept. 1994 | Paris, France | David L. Hawksworth | Francesco Di Castri | Tokindo Okada, Vladimir E. Sokolov | Marvalee H. Wake | Ernst-Detlef Schulze | +13 Executive Members |
| 24 | Sept. 1991 | Amsterdam, Netherlands | Francesco Di Castri | János Salánki | Tokindo Okada, Vladimir E. Sokolov | Donald E. Stone | Derek F. Roberts | |
| 23 | Oct. 1988 | Canberra, Australia | János Salánki | Otto T. Solbrig | W. David L. Ride, Francesco Di Castri | Grégoire Nicolis | Derek F. Roberts | |
| 22 | Sept. 1985 | Budapest, Hungary | Otto T. Solbrig | Paolo Fasella | W. David L. Ride, János Salánki | Francesco Di Castri | Derek F. Roberts | |
| 21 | Aug. 1982 | Ottawa, Canada | Paolo Fasella | Eduardo De Robertis | W. David L. Ride, Otto T. Solbrig | W. David L. Ride, Otto T. Solbrig | Claude Lévi | |
| 20 | Aug. 1979 | Helsinki, Finland | Eduardo De Robertis | Nils Oker-Blom | M.S. Ghilarov, Paolo Fasella | Edward S. Ayensu | Edward S. Ayensu | |
| 19 | Aug./ Sept. 1976 | Bangalore, India | Nils Oker-Blom | Knut Faegri | Eduardo De Robertis, M.S. Ghilarov | Edward S. Ayensu | Edward S. Ayensu | |
| 18 | Sept. 1973 | Ustaoset, Norway | Knut Faegri | Donald S. Farner | Frans A. Stafleu, Nils Oker-Blom | Christopher Wright | Karl Egle | |
| 17 | Oct. 1970 | Washington, D.C., USA | Donald S. Farner | I. Malek, Frans A. Stafleu | Knut Faegri | Karl Egle | ||
| 16 | Sept. 1967 | Montreux, Switzerland | Donald S. Farner | C.H. Waddington | J.G. Baer, I. Malek | Frans A. Stafleu | Karl Egle | |
| 15 | July 1964 | Prague, Czechoslovakia | C.H. Waddington | Giuseppe Montalenti | J.G. Baer | D. S. Farner | Frans A. Stafleu | |
| 14 | July 1961 | Amsterdam, Netherlands | C.H. Waddington | Giuseppe Montalenti | P. Chouard | G.L. Stebbins | J. Lanjouw | |
| 13 | 1958 | London, England | Giuseppe Montalenti | P. Chouard | G.L. Stebbins | J. Lanjouw | ||
| 12 | April 1955 | Rome, Italy | S. Horstadius | R.E. Cledland | Giuseppe Montalenti | J. Lanjouw | ||
| 11 | Aug. 1953 | Nice, France | S. Horstadius | H. Munro Fox | R.E. Cledland | Giuseppe Montalenti | A. Linder | |
| 10 | July 1950 | Stockholm, Sweden | H. Munro Fox | M.J. Sirks | J. Runnström | Paul Vayssiere | Francis Chodat | |
| 9 | July 1947 | Copenhagen, Denmark | M.J. Sirks | E.D. Merrill | H. Munro Fox | Paul Vayssiere | Francis Chodat | |
| 8 | Sept. 1935 | Amsterdam, Netherlands | E.D. Merrill | A.C. Seward | M.S. Watson | M.J. Sirks | Arnold Picket | |
| 7 | July 1931 | Brussels, Belgium | A.C. Seward | F.W. Went | E. Godewski | M. De Selys-Longchamps | Arnold Pictet | |
| 6 | July 1928 | Brussels, Belgium | F.W. Went | Léon Fredericq | F. Botatazzi, Odón De Buen, B. Neme, A. Lameer, E. Terroine | M. De Selys-Longchamps | ||
| 5 | July 1927 | Geneva, Switzerland | ||||||
| 4 | May 1926 | Paris, France | Léon Fredericq | G. Fano, J. Briquet, A. Mayer, F.W. Went | Emile Faure-Fremiet | Arnold Pictet | ||
| 3 | July 1925 | Brussels, Belgium | Léon Fredericq | G. Fano, J. Briquet, A. Mayer, F.W. Went | Emile Faure-Fremiet | |||
| 2 | July 1922 | Brussels, Belgium | Léon Fredericq | Marie-Yves Delage | E. H. Starling | Charles Flahault | ||
| 1 | July 1919 | Brussels, Belgium | Marie-Yves Delage | W. Bateson | Charles Flahault |