NACLO 2023 - North American Computational Linguistics Open competition
Columbia University, Computer Science Department

Important Dates:

January 26, 2023
Time TBA
NACLO Open Round (first round), virtually on Zoom

March 16, 2023
Time TBA
NACLO Invitational Round (second round)

What is NACLO?

NACLO (the North American Computational Linguistics Open competition) is a contest in which high-school students, as well as middle-school students, solve problems relating to linguistics and computational linguistics. No prior knowledge of linguistics or second languages is required. Students may participate at their high school or at a nearby university site. This year, Columbia University will be the local university site for the New York Metropolitan area. The open round of the contest will take place on Thursday, January 26, 2023. Well-performing students will be invited to the second (invitational) round, which is scheduled to take place on March 16, 2023. The top students in the second round will have a chance to participate in the International Linguistics Olympiad, one of thirteen international high school science Olympiads.

More information about NACLO, including a student handbook and practice problems, can be found at the official NACLO website,


How can I register for the Open (first) Round?

Students who are interested can register at the NACLO registration site. Deadline TBA
Participation in the event is free.


Where is the Columbia University location for the Open (first) Round?

Columbia University will hold the NACLO Competition Open Round on its Morningside Heights campus. The precise location will be announced on this page in mid January.


When should I arrive for the Open (first) Round?

The contest begins promptly at ??am and runs three hours until ??pm on Thursday, January 26, 2022. Please arrive no later than ??am in order to have the instructions read to you. Students who arrive late are not allowed to have extra time to have instructions/ announcements repeated for them.


Where is the Columbia University site for second (invitational) round?

To be announced.


When should I arrive for the second (invitational) round?

To be announced.


What should I study?

Some sample questions for practice are available here.


Who should I contact?

Please ask us any questions you might have.

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