Twenty-two years of linguistic problems, archived and annotated.
From Sofia 2003 to Bucharest 2026, the International Linguistics Olympiad has placed forty-two nations’ secondary students before the same set of puzzles — phonology, morphology, scripts in cipher, the deep regularities beneath linguistic surface variety. No prior coursework in linguistics is assumed, no insider vocabulary required: every problem is solvable from a short corpus and careful reasoning. This independent community guide archives every contest, annotates the signature solutions, and walks new students from their first sample problem to their national selection round.
Twenty-two contests, forty-two countries, two hundred and twenty-seven solvers in the most recent edition.
Each summer since 2003, a growing federation of national linguistics olympiads has converged on a single weeklong contest. The 2025 edition in Taipei drew 227 finalists across 57 teams from 42 participating countries — the largest cohort in the contest’s history. The 23rd IOL convenes in Bucharest, 26 July to 2 August 2026.
Recent contests & their signature problems
The Kazakh round — vowel harmony from twelve sentences
A phonology problem drawn from a sparse corpus of Kazakh nominalizations. Solvers had to derive the eight-vowel inventory from twelve glossed sentences and predict three previously unseen stems. Median solve time among medalists: under forty minutes.
The Wamesa script — a four-row decipherment
A four-row decipherment problem set in a Trans-New-Guinean orthography, the Wamesa script. The first Brazilian-hosted edition, with a particularly strong showing from the Asia-Pacific delegations and a tight gold-silver boundary at fewer than three points.
Twenty years on — back to Bulgaria
The twentieth-anniversary edition revisited the original 2003 Sofia problem space. Bulgarian organisers reprised the founding format, signalled a return to roots, and produced one of the most difficult individual rounds on record — only three perfect scores out of 218 contestants.
No prior knowledge of linguistics is required — what IOL tests is the structure of reasoning itself, applied to the wild diversity of human language.Competition Regulations · ioling.org
Four steps from first puzzle to IOL selection
Solve a sample
Start with one of the eighteen sample problems on ioling.org. Begin in the easy tier — Georgian Countries, Japanese Braille, Persian — before moving up to intermediate. Most students finish their first problem within forty minutes.
Join a cohort
Scan our WhatsApp QR to enter a small worldwide grade 7-12 cohort. Free, mentor-routed, no spam, no fees. Expect a one-on-one welcome message within twenty-four hours and an invite to the next weekly walkthrough.
Train weekly
Walk through one archive problem per week with peers, guided by a mentor who has competed at IOL. Twelve weeks of consistent training gets most students from easy tier to intermediate, ready for national selection.
Try IOL selection
Sit your national selection round — NACLO in North America, UKLO in the United Kingdom, the All-Russian Olympiad in Russia, and counterparts elsewhere. Top finishers represent their country at the IOL itself; next is Bucharest, 26 July 2026.
IOL alumni read for linguistics at MIT, Harvard, Oxford
The International Linguistics Olympiad is recognised by leading universities as a signal of analytical reasoning, pattern recognition, and the patience for ambiguous data. Past medalists have gone on to doctoral programmes in computational linguistics, cognitive science, and theoretical phonology at MIT, Harvard, Stanford, Cambridge, Oxford, Yale, Penn, and Princeton, among others.
Selection committees at competitive admissions offices read an IOL medal not as a niche language credential but as evidence of disciplined inference under constraint — the same intellectual habit prized by mathematics, computer science, and analytic philosophy programmes. Several alumni have published their first peer-reviewed paper before age twenty-two.
Where alumni outcomes are publicly known, our /winners/ page indexes them by year and country — always with permission and a citation back to the original announcement.
Join a small worldwide cohort preparing for IOL 2026.
Weekly problem walkthroughs, archived training calls, and a quiet WhatsApp group for grades 7-12. Scan to add the club mentor — one-on-one routing, no spam, no fees. Mentors are former IOL participants and current undergraduates in linguistics, computer science, and cognitive science programmes at top universities, contributing voluntarily because the contest gave each of them their start.
Five things students ask before their first IOL.
How this guide is made.
Sources. Every contest fact on this site links back to ioling.org, the official IOL website. Problem texts are quoted under fair-use convention with attribution to the original-language contest packet. Statistics about contestant counts, country participation, and host cities are verified against the official past-contests index before publication.
Independence. This guide is an independent community club. We are not affiliated with the IOL Board and do not represent any national selection. Any view expressed here is the editorial team’s, not the contest organisers’.
Translation. Where original problems exist only in non-English, we publish the English version released by IOL — and link to the original-language packet when available. We do not translate problems ourselves; for non-released languages we cite and link, never reproduce.
Volunteers. Walkthroughs and annotations are written by current undergraduates and recent IOL participants. Each author is credited in the relevant article. Mentor identities in the WhatsApp group are de-identified by default to protect student privacy.
Corrections. Found an error? Scan the WhatsApp QR and send a note — corrections are dated, attributed to the reporter (with permission), and re-verified against the source.
Updates. The archive is reviewed and refreshed at the end of each IOL season — new contest results are added within four weeks of the closing ceremony, signature problems are annotated by participating mentors, and any deprecated facts (changed dates, relocated host cities, retired contestants) are flagged with strike-through and a dated note explaining the change.