- 主辦國家
| 年 | 城市 | 國家 | 期間 | 網站 |
|---|---|---|---|---|
| 2027 | Germany | IOI 2027 | ||
| 2026 | Uzbekistan | IOI 2026 | ||
| 2025 | Sucre | Bolivia | 7/27~8/3 | IOI 2025 |
| 2024 | El Alamein | Egypt | 9/1~9/8 | IOI 2024 |
| 2023 | Szeged | Hungary | 8/28~9/4 | IOI 2023 |
| 2022 | Yogyakarta | Indonesia | 8/7~8/15 | IOI 2022 |
| 2021 | 線上賽 | Singapore | 6/20~6/27 | IOI 2021 |
| 2020 | 線上賽 | Singapore | 9/13~9/19 | IOI 2020 |
| 2019 | Baku | Azerbaijan | 8/4-8/11 | IOI 2019 |
| 2018 | Tsukuba | Japan | 9/1~9/8 | IOI 2018 |
| 2017 | Tehran | Iran | 7/28~8/4 | IOI 2017 |
| 2016 | Kazan | Russia | 8/12~8/19 | IOI 2016 |
| 2015 | Almaty | Kazakhstan | 7/26~8/2 | IOI 2015 |
| 2014 | Taipei | Taiwan | 7/13~7/20 | IOI 2014 |
| 2013 | Brisbane | Australia | 7/6~7/13 | IOI 2013 |
| 2012 | Sirmione-Montichiari | Italy | 9/23~9/30 | IOI 2012 |
| 2011 | Pattaya | Thailand | 7/22~7/29 | IOI 2011 |
| 2010 | Ontario | Canada | 8/14~8/21 | IOI 2010 |
| 2009 | Plovdiv | Bulgaria | 8/8~8/15 | IOI 2009 |
| 2008 | Cairo | Egypt | 8/16~8/23 | |
| 2007 | Zagreb | Croatia | 8/15~8/22 | IOI 2007 |
| 2006 | Mérida, Yucatán | México | 8/13~8/20 | |
| 2005 | Nowy Sącz | Poland | 8/18~8/25 | IOI 2005 |
| 2004 | Athens | Greece | 9/11~9/18 | |
| 2003 | Wisconsin | USA | 8/16~8/23 | |
| 2002 | Yong-In | South Korea | 8/18~8/25 | IOI 2002 |
| 2001 | Tampere | Finland | 7/14~7/21 | |
| 2000 | Beijing | China | 9/23~9/30 | IOI 2000 |
| 1999 | Antalya-Belek | Turkey | 10/9~10/16 | IOI 1999 |
| 1998 | Sebu’tal | Portugal | 9/5~9/12 | |
| 1997 | Cape Town | South Africa | 11/30~12/7 | |
| 1996 | Veszprem | Hungary | 7/25~8/2 | |
| 1995 | Eindhoven | The Netherlands | 6/26~7/3 | IOI 1995 |
| 1994 | Haninge | Sweden | 7/3~7/10 | |
| 1993 | Mendoza | Argentina | ||
| 1992 | Bonn | Germany | ||
| 1991 | Athens | Greece | ||
| 1990 | Minsk | Belarussian Republic, Soviet Union | ||
| 1989 | Pravetz | Bulgaria |