November 25, 2010
IOI Photos have been posted
August 15, 2010
Posted first Newsletter
July 29, 2010
IOI Program
July 29, 2010
Schedule updated including information about new Evening Lectures.
July 5, 2010
Rules, competition environment and sample tasks added to site.
May 27, 2010
Registration activated and many ioi2010.org web updates.
Participants
Regular participating countries at the IOI:
| Albania | Argentina | Armenia | Australia |
| Austria | Azerbaijan | Bangladesh | Belarus |
| Belgium | Bosnia and Herzegovina | Brazil | Bulgaria |
| Canada | Chile | China | Chinese Taipei |
| Colombia | Croatia | Cuba | Cyprus |
| Czech Republic | Denmark | Egypt | Estonia |
| Finland | France | Georgia | Germany |
| Ghana | Greece | Hong Kong, China | Hungary |
| India | Indonesia | Iran | Ireland |
| Israel | Italy | Japan | Kazakhstan |
| Korea, Republic of | Kuwait | Kyrgyzstan | Latvia |
| Libya | Lithuania | Luxemburg | Macau, China |
| Macedonia, FYRO | Malaysia | Mexico | Moldova |
| Mongolia | Montenegro | Netherlands | New Zealand |
| Nigeria | Norway | Poland | Portugal |
| Romania | Russian Federation | Saudi Arabia | Serbia |
| Singapore | Slovakia | Slovenia | South Africa |
| Spain | Sri Lanka | Sweden | Switzerland |
| Syria | Tajikistan | Thailand | Trinidad and Tobago |
| Turkey | Turkmenistan | Ukraine | United Arab Emirates |
| United Kingdom | United States of America | Venezuela | Viet Nam |