The International Committee (IC) for the IOI was founded by the assembly of all delegates participating in the first IOI at the 19th of May 1989 in Pravetz, Bulgaria.

Former Members of the International Committee include:

• Ágnes Erdősné Németh, Hungary (2019 – 2022, Host IOI’23)
• Alexandre Cerveira, Portugal, (1998 - 1999, Host IOI'98, Secretary-General in 1999)
• Alicia Bañuelos, Argentina (1990 - 1996, Host IOI'93)
• António Caleço, Portugal (1996 - 2001, Host IOI'98)
• Arturo Cepeda, Mexico (2002 - 2011, Host IOI2006, IOI President 2008 - 2011)
• Bakhyt Matkarimov, Kazakhstan (2011 - 2016, Host IOI'15)
• Benjamin Burton, Australia (2014 - 2017, elected at IOI'14)
• Brian Marshal, Indonesia (2023 - 2023, Host IOI'22)
• Catherine Espinoza, Chile (2021 - 2023, elected at IOI'21)
• David Ginat, Israel (2010 - 2013, elected at IOI'10)
• Donald Theodore Piele, United States of America (1993 - 2006, elected 1993, re-elected 1996, Host IOI2003, IC Chair 2004)
• Eljakim Schrijvers, Netherlands (2006 - 2012, elected at IOI'06, re-elected at IOI'09)
• Fuad Hajiyev, Azerbaijan (2015 - 2017, host IOI'19)
• Gabriele Reich, Germany (1993 - 1995, Host IOI'92)
• Giuseppe Colosio, Italy (2008 - 2013, Host IOI'12)
• Göktürk Üçoluk, Türkiye (1996 - 2002, Host IOI'99, IC Chair 2000)
• Greg Lee, Taiwan (2017 - 2021, IOI President, elected at IOI'17, IC member 2010 - 2015, Host IOI'14)
• Ha-Jine Kimn, Korean Republic (1992 - 1996, 1998 - 2005, Host IOI2002, IC Chair 2003)
• Håkan Strömberg, Sweden (1991 - 1997, Host IOI'94)
• Hongxi Xue, China (1996 - 1998, Host IOI 2000)
• Ivo Šeparović, Croatia (2003 - 2008, Host IOI2007)
• Jari Koivisto, Finland (1997 - 2004, Host IOI2001, IC Chair 2002, 2006 - 2008 Executive Director, Non-Voting)
• Jyrki Nummenmaa, Finland (2001 - 2001, extra from Host IOI2001)
• Kanchit Malaivongs, Thailand (1993 - 1996, 2007 - 2012, Host IOI'11)
• Krassimir Manev, Bulgaria (2000 - 2003, 2005 - 2013, elected at IOI'00, host IOI'09, re-elected at IOI'10, IOI President 2014 - 2017, elected at IOI'14)
• Kresimir Malnar, Croatia (2011 - 2014, 2015 - 2018, elected at IOI'11, re-elected at IOI'15)
• Krzysztof Diks, Poland (2001 - 2007, Host IOI2005, IC Chair IOI2005)
• László Jobbágy, Hungary (2023, Host IOI'23)
• László Zsakó, Hungary (1996 - 199?, extra from Host IOI'96)
• 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)
• Madhavan Mukund, India (2011 - 2014, Executive Director)
• Makhliyo Muksinova, Uzbekistan (2023, Host IOI'26)
• Margot Phillipps, New Zealand (Secretary 2018-2020, Executive Director 2014-2016)
• Mario Cruz, Colombia (2001 - 2004, elected at IOI2001)
• Mārtiņš Opmanis, Latvia (2012 - 2015, elected at IOI'12)
• Mathias Hiron, France (2016 - 2019, elected at IOI'16) 
• Metodija Janceski, Macedonia (2007 - 2010, elected at IOI'07)
• Mile Jovanov, Macedonia (2015 - 2019, 2019 - 2023, elected at IOI'15, re-elected at IOI'18, re-elected at IOI'19)
• Mohamed Youssef, Egypt (2004 - 2009, Host IOI'08)
• Mohammad Ali Abam, Iran (2013 - 2018, Host IOI'17)
• Mohammed Ghodsi, Iran (1996 - 1998, elected)
• Ossama Ismaeil, Egypt (2004 - 2005, Host IOI2008, succeeded by Yasser M. Abdel Ghany)
• Pedro Guerreiro, Portugal (199? - 1995, Host IOI'98)
• Péter Hanák, Hungary (1991 - 1999, Host IOI'96)
• Peter Taylor, Australia (2009 - 2014, Host IOI'13)
• Peter Waker, South Africa (1993 - 1995, Host IOI'97)
• Ria van Ouwerkerk, The Netherlands (1995 - 1998, extra from Host IOI'95)
• Ricardo Anido, Brazil (2004 - 2007, 2013 - 2018, 2021 - 2022: elected at IOI’04, elected at IOI’13, Executive Director 2016 - 2017, Secretary 2017 - 2018, elected at IOI’21)
• Richard Forster, Great Britain (2011 - 2014, IOI President, elected 2011, IC member 1998 - 2001, elected at IOI'98, 2005 - 2008, elected at IOI'05)
• Ries Kock, The Netherlands (1990 - 1998, Host IOI'95)
• Rogelio Garcia Llano, Argentina (2007 - 2010, elected at IOI'07)
• Seiichi Tani, Japan (2014 - 2019, host IOI'18) 
• Spyros Bakogiannis, Greece (2000 - 2006, Host IOI2004, IC Chair 2005)
• Stanislaw Waligorski, Poland (1997 - 2000, elected at IOI'97?)
• Steven Halim, Singapore (2019 - 2021, host IOI'20, filling a vacant elected 2019 - 2023 slot)
• Troy Vasiga, Canada (2006 - 2011, Host IOI'10)
• Valentina Dagiene, Lithuania (2017 - 2021, 2006 - 2015, elected at IOI'06, re-elected at IOI'09, IOI'12, and IOI'17)
• Vladimir Kiryukhin, Russia (1989 - 1992, 1999 - 2002, elected at IOI'99, 2012 - 2017, Host IOI'16)
• Wolfgang Pohl, Germany (2003 - 2006, elected at IOI2003, also acting as Executive Director ad interim from January 2006 to August 2006)
• Yasser M. Abdel Ghany, Egypt (2004 - 2007, elected at IOI2002, serving through IOI2005; since IOI 2006 for Host IOI2008)
• Yngve Lindberg, Sweden (1991 - 1995, extra from Host IOI'94)
• Yugo Kartono Isal, Indonesia (2018 - 2023, Host IOI'22)
• Zide Du, China (1996 - 2003, 2005 - 2008, Host IOI2000, IC Chair 2001, IOI President, elected 2005)