What is NACLO?

The North American Computational Linguistics Olympiad is a contest in which high-school students solve linguistic puzzles. In solving these puzzles, students learn about the diversity and consistency of language, while exercising logic skills. No prior knowledge of linguistics or second languages is necessary. Professionals in linguistics, computational linguistics and language technologies use dozens of languages to create engaging problems that represent cutting edge issues in their fields. The competition has attracted top students to study and work in those same fields. It is truly an opportunity for young people to experience a taste of natural-language processing in the 21st century.


  • July 10, 2017 Student registration for 2018 will start in September 2017. Student registrations are not carried over from one year to the next. Site registrations (high school and university sites) are automatically copied from one year to the next.
  • Friday, July 7, 2017Press Release about the teams selected by NACLO who are going to the 2017 International Linguistics Olympiad in Dublin.
  • Friday, April 11, 2017Press Release about the 2017 Invitational Round.
  • April 3, 2017The problems from the two rounds of the 2017 contest have been posted here.
  • April 2, 2017The unofficial results from the Invitational Round are here.
  • February 28, 2017The results from the Open Round have been posted. You can see your scores by logging in at the bottom of this page. The list of US students who qualified for the second round so far is listed here. A total of 171 students have qualified (including 156 from the USA and 15 from Canada).
  • Article about NACLO by Margarita Misirpashaeva
  • July 18, 2016The NACLO 2017 Student Handbook
  • July 18, 2016The NACLO 2017 Coordinator Handbook
  • July 18, 2016The NACLO 2017 Appendix
  • June 7, 2016The 2017 contest will be on January 26 (Open Round) and March 9 (Invitational Round).
  • Thursday, March 31, 2016The problem sets for this year's Open and Invitational rounds are now available here.
  • Thursday, March 31, 2016Grading for the Invitational Round is over. The results are here.
  • Sunday, February 21, 2016The anonymized list of students who qualified for the second round is here.
  • Saturday, February 20, 2016The results from the Open Round have been announced. Students can log on to their accounts and see their scores. The cutoff for qualification is 44 points. A total of 174 students have qualified. The Invitational Round is on March 10. Please contact your site hosts for details.

Please Donate

You can help support NACLO either by mailing a check or giving online. For more information on both, please see our donations page. We thank you for your support!


We're looking for new sites and problem contributors. Please contact us at naclo17org@umich.edu.