The yearly International Biology Olympiad

Here you will find interesting information about the next and past IBOs.

Date & Schedule

The world's largest biology competition for secondary school students takes place every year in a different country. The next IBO will be held 18-25 July 2021 in Lisbon, Portugal.


The competitors come each year from more than seventy IBO member countries and regions. They are recruited among the most successful participants of National Biology Olympiads.

Over the years, Jury members or associates have been awarded for their work in IBO and their contributions to the development of our competition.

Future IBOs

The IBO competition is an event that has to be planned years in advance. The list of future host countries is here.

Past IBOs

The fist IBO competition was held in 1990 in former Czechoslovakia. The countries that have been hosting IBO since then can be found here.