- Ricardo Anido, Brazil, ranido_at_ic.unicamp.br
(2004 - 2007, elected at IOI2004, 2013 - 2016, re-elected at IOI2013, Executive Director 2016 - 2017, Secretary 2017 - 2018)
- Mohammad Ali Abam, Iran, abam_at_sharif.edu (2013 - 2018, Host IOI'17)
- Spyros Bakogiannis, Greece, s.bakogiannis_at_eede.org
(2000 - 2006, Host IOI2004, IC Chair 2005)
- Alicia Bañuelos, Argentina, ali_at_meyosp.mecon.ar
(1990 - 1996, Host IOI'93)
- Benjamin Burton, Australia, bab_at_debian.org
(2014 - 2017, elected at IOI'14)
- António Caleço, Portugal, api_at_mail.telepac.pt
(1996 - 2001, Host IOI'98)
- Arturo Cepeda, Mexico, acepeda_at_auronix.com
(2002 - 2011, Host IOI2006, IOI President 2008 - 2011)
- Alexandre Cerveira, Portugal, ac_at_univ-ab.pt (was: cerveira_at_univ-ab.pt)
(1998 - 1999, Host IOI'98, Secretary-General in 1999)
- Giuseppe Colosio, Italy, giuseppe.colosio_at_istruzione.it
(2008 - 2013, Host IOI'12)
- Mario Cruz, Colombia, olimpia_at_uan.edu.co
(2001 - 2004, elected at IOI2001)
- Valentina Dagiene, Lithuania, dagiene_at_ktl.mii.lt
(2006 - 2015, elected at IOI'06, re-elected at IOI'09
and IOI'12)
- Krzysztof Diks, Poland, diks_at_mimuw.edu.pl
(2001 - 2007, Host IOI2005, IC Chair IOI2005)
- Zide Du, China, zidedu_at_ict.ac.cn
(1996 - 2003, 2005 - 2008, Host IOI2000, IC Chair 2001, IOI President, elected 2005)
- Richard Forster, Great Britain forster_at_olympiad.org.uk
(2011 - 2014, IOI President, elected 2011, IC member 1998 - 2001, elected at IOI'98, 2005 - 2008,
elected at IOI'05)
- Yasser M. Abdel Ghany, Egypt, yasserag_at_aast.edu
(2004 - 2007, elected at IOI2002, serving through IOI2005; since IOI 2006 for Host IOI2008)
- Mohammed Ghodsi, Iran, ghodsi_at_sina.sharif.ac.ir
(1996 - 1998, elected)
- David Ginat, Israel, ginat_at_post.tau.ac.il
(2010 - 2013, elected at IOI'10)
- Pedro Guerreiro, Portugal, pg_at_fct.unl.pt
(199? - 1995, Host IOI'98)
- Péter Hanák, Hungary, hanak_at_inf.bme.hu
(1991 - 1999, Host IOI'96)
- Fuyad Hajiyev, Azerbaijan, fuadhaci_at_gmail.com (2015 - 2017, Host IOI'19)
- Lionel Hartmann, South Africa,
(1996 - 2000, 2000 - 2005, Host IOI'97, Executive Director 2000-2003, re-appointed 2003-2006, but retired end of 2005, Non-voting)
- Ossama Ismaeil, Egypt, ossama_at_aast.edu
(2004 - 2005, Host IOI2008, succeeded by Yasser M. Abdel Ghany)
- Metodija Janceski, Macedonia, meto_at_ii.edu.mk
(2007 - 2010, elected at IOI'07)
- Ha-Jine Kimn, Korean Republic, hjkimn_at_ajou.ac.kr (or hjkimn_at_garam.kreonet.re.kr)
(1992 - 1996, 1998 - 2005, Host IOI2002, IC Chair 2003)
- Vladimir Kiryukhin, Russia, vkiryukh_at_gmail.com
(1989 - 1992, 1999 - 2002, elected at IOI'99, 2012 - 2017, Host IOI'16)
- Ries Kock, The Netherlands, R.Kock_at_slo.nl
(1990 - 1998, Host IOI'95)
- Jari Koivisto, Finland, jari.koivisto_at_oph.fi
(1997 - 2004, Host IOI2001, IC Chair 2002, 2006 - 2008 Executive Director, Non-Voting)
- Greg Lee, Taiwan, leeg_at_csie.ntnu.edu.tw
(2010 - 2015, Host IOI'14)
- Yngve Lindberg, Sweden
(1991 - 1995, extra from Host IOI'94)
- Rogelio Garcia Llano, Argentina, rgllano_at_unsam.edu.ar
(2007 - 2010, elected at IOI'07)
- Kresimir Malnar, Croatia, malnar_at_hsin.hr
(2011 - 2014, 2015 - 2018 elected at IOI'11, re-elected at IOI'15)
- Krassimir Manev, Bulgaria, kmanev_at_nbu.bg
(2000 - 2003, 2005 - 2013, elected at IOI'00, host IOI'09, re-elected at IOI'10,
IOI President 2014 - 2017, elected at IOI'14)
- Kanchit Malaivongs, Thailand, kmala_at_ipst.ac.th
(1993 - 1996, 2007 - 2012, Host IOI'11)
- Bakhyt Matkarimov, Kazakhstan, bakhyt.matkarimov_at_gmail.com
(2011 - 2016, Host IOI'15)
- Madhavan Mukund , India madhavan_at_cmi.ac.in
(2011 - 2014, Executive Director)
- Fredrik Niemelä, niemela_at_kth.se
(2008 - 2011, elected at IOI '08)
- Jyrki Nummenmaa, Finland, jyrki_at_cs.uta.fi
(2001 - 2001, extra from Host IOI2001)
- Mārtiņš Opmanis, Latvia, Martins.Opmanis_at_lumii.lv
(2012 - 2015, elected at IOI'12)
- Ria van Ouwerkerk, The Netherlands, wsinro_at_win.tue.nl
(1995 - 1998, extra from Host IOI'95)
- Donald Theodore Piele, United States of America, piele_at_uwp.edu
(1993 - 2006, elected 1993, re-elected 1996, Host IOI2003, IC Chair 2004)
- Wolfgang Pohl, Germany, pohl_at_bwinf.de
(2003 - 2006, elected at IOI2003, also acting as Executive Director ad interim from January 2006 to August 2006)
- Gabriele Reich, Germany, BwInf_at_gmd.de
(1993 - 1995, Host IOI'92)
- Eljakim Schrijvers, Netherlands, eschrijvers_at_eljakim.nl
(2006 - 2012, elected at IOI'06, re-elected at IOI'09)
- Ivo Šeparović, Croatia, isepar_at_hsin.hr
(2003 - 2008, Host IOI2007)
- Håkan Strömberg, Sweden, hakan_at_haninge.kth.se
(1991 - 1997, Host IOI'94)
- Peter Taylor, Australia, pjt013_at_gmail.com
(2009 - 2014, Host IOI'13)
- Göktürk Üçoluk, Turkey, ucoluk_at_ceng.metu.edu.tr
(1996 - 2002, Host IOI'99, IC Chair 2000)
- Peter Waker, South Africa, waker_at_cssa.org.za
(1993 - 1995, Host IOI'97)
- Stanislaw Waligorski, Poland, waligor_at_mimuw.edu.pl
(1997 - 2000, elected at IOI'97?)
- Hongxi Xue, China, xuehx_at_tiger.cs.tsinghua.edu.cn
(1996 - 1998, Host IOI 2000)
- Mohamed Youssef, Egypt, myousef_at_aast.edu
(2004 - 2009, Host IOI'08)
- Troy Vasiga, Canada, tmjvasiga_at_cs.uwaterloo.ca
(2006 - 2011, Host IOI'10)
- László Zsakó, Hungary, zsako_at_ludens.elte.hu
(1996 - 199?, extra from Host IOI'96)
- ?, Turkey, ?
(2000 - 2000, extra from Host IOI'99)
