IOL International Linguistics Olympiad

1. Competition Process 

Every year, each participating country sends 1-2 teams of 4 contestants. Each country has its own competition to select contestants. In this section, we will cover the NACLO competition process, which is North America’s National Linguistics Olympiad. The process for selecting contestants and forming teams varies across countries. Typically, contestants are selected from the winners of their National Linguistics Olympiad. To learn more about the selection process in your country, click here. 

2. Countries

Below is the complete list of currently accredited countries and regions as of August 2025.

Australia, Brazil, Bulgaria, Canada Anglophone, Canada Francophone, China, Colombia, Czechia, Estonia, Finland, Germany, Greece, Hong Kong, Hungary, India, Iran, Ireland, Isle of Man, Israel, Japan, Kazakhstan, Latvia, Macau, Malaysia, Malta, Moldova, Nepal, Netherlands, Philippines, Poland, Republic of Korea, Romania, Russia, Singapore, Slovenia, Spain, Sweden, Switzerland, Taiwan, Thailand, Ukraine, United Kingdom, United States of America.

3. NACLO (North American Computational Linguistics Open Competition)

NACLO is a competition for students in the U.S. and Canada to select winners to compete in the International Linguistic Olympiad, one of the twelve international high school academic olympiads. In the competition, pre-university students solve puzzles in linguistics and computational linguistics.

Eligibility:

To participate in the North American Computational Linguistics Olympiad (NACLO), candidates must: not have been enrolled as a full-time college or university student, be under 20 years old on the first day of the International Olympiad in Linguistics (IOL), and be either a citizen of the U.S. or Canada or a secondary school student in those countries. Participants must also be available to compete at one of the scheduled contest times and can either take part at a registered university site or find a teacher or librarian to host a high school site, according to the specified guidelines. Students should also adhere to all eligibility rules outlined in the IOL eligibility guidelines.

Competition Progress:

• Open Round (January 29, 2026): Interested middle school and high school students will solve 6-9 problems during the Open Round. 
• Invitational Round (March 19, 2026): Students who perform well in the Open Round will solve 8-12 more difficult problems in the Invitational Round to earn a spot in the IOL. 
• International Linguistics Olympiad: This is an international competition where students from around the globe gather in a country and compete for a chance to earn recognition and valuable prizes.

Problems: 

Students may expect the problem types below: 

• Translation problems: translating sentences from a foreign language to English, with attention to unique grammatical structures and cultural nuances. 
• Number Problems: Focuses on translating arithmetic facts from a foreign language, considering variations in numerical bases or counting systems, where different terms may be used for the same number depending on context.
• Writing Systems: Involves deciphering a specific writing system to reproduce a given text, which may include challenges like right-to-left scripts, lack of vowels, or different symbol systems.
• Calendar Systems: Entails understanding the calendar used by a civilization through context provided in sentences referencing time and dates.
• Formal Problems: Requires constructing a logical model for language transformations, such as converting active voice sentences into passive voice by following specific grammatical rules.
• Phonological Problems: Focuses on analyzing the connection between a language’s sounds and its writing system, including how phonetic elements correspond to written forms.
• Computational Problems: Involves creating algorithms or procedures for linguistic tasks that can be executed by a computer, such as translation or data processing.
• Other Types: Encompasses a range of additional linguistic challenges, including deciphering kinship systems, transcribing spoken language, associating sentences with visual imagery, and translating entirely unknown languages.

Sample problems can be found here. 

4. Prizes

Participants in the IOL can earn a chance to receive medals (Gold, Silver, and Bronze Medals), Honorable Mentions, Team Contest Medals, Trophy for the country with the highest average scores, and Best Solution Prizes.