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North American Computational Linguistics Open competition

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What is NACLO?

‚ÄčThe North American Computational Linguistics Open competition (NACLO) is a fun (and educational!) contest for U.S. and Canadian high school students in which contestants compete by solving compelling and creative puzzles in linguistics and computational linguistics. Requiring no previous knowledge of linguistics, languages, or computing, these puzzles can be solved by analytic reasoning alone, and serve as a fun introduction to a field to which many high school students have never been introduced. Winners of NACLO are eligible to compete in the International Linguistics Olympiad, one of twelve international high school science Olympiads.

Find more information, including the student handbook, go to

How do I join the contest?

You can register through the NACLO web site ( The registration form is located by clicking on the "student" tab.  

UD is unable to host NACLO this year, but students can select the "AT-HOME" option if none of the alternative testing sites are feasible.


Date, Time, and Location

Registration Deadline: January 15, 2021

Open Round: January 28, 2021

Invitational Round: March 11, 2021


UD is unable to host NACLO this year; however, students have the option to participate from home this year.

For directions to the university and campus maps, visit

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North American Computational Linguistics Open competition
  • Department of Linguistics and Cognitive Science
  • 125 E. Main Street
  • University of Delaware
  • Newark, DE 19716, USA
  • Phone: 302-831-6806
  • Fax: 302-831-6896