Just finished
IOI 2023 was hosted by Hungary. Visit the official website to learn more.
Just finished IOI 2023 in Hungary
Members
Here is a list of the countries and regions which have participated in the last three International Olympiads in Informatics.
It is intended that each country or region have a website or e-mail (or both) for contact purposes.

Armenia
Email

Romania
Email

Russia
No contacts

Tajikistan
Email

Turkmenistan
Email

Uzbekistan
Email

Venezuela
Email

Vietnam
Email
Former members

Gabon

Ghana

Kuwait

Madagascar

Malta

Mauritius
Email

Mozambique

Sudan
Email

Trinidad and Tobago

United Arab Emirates
Email

Zimbabwe
According to S2.1 of IOI Regulations: "For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs".