The International Olympiad in Informatics (IOI) is the most prestigious annual Olympiad in Informatics among high school students. It was first held in Bulgaria in 1989. Ukraine has been participating in the Olympiad since 1992.

The competition consists of two days of programming and solving algorithmic problems. Competitors in each country are selected for their country's teams through national Olympiads. Participants compete on an individual basis.

The patrons of the Olympiad are UNESCO and IFIP.

To get to the Olympiad, you need to participate in the Ukrainian Olympiad in Informatics.