The 4th WEOI (2026) will be held on June 26th – 28th, in a hybrid format in Luxembourg.
Sponsored by
Participating Teams
In alphabetical order
 | Belgium On-site Team Leaders Robin Jadoul Alban Van Vyve | Noé Zech Thomas De Bruyn Edward Rosseel Joaquim Schaeverbeke Paul Van Schaftingen Chong Shan |
 | France On-site Team Leaders Louis Jachiet Yixuan Qu | Clemence Pham Ines Fischler Coraline Kalbfleisch Valentine Pommier Hao Yuan Jiao Raphael Pons Daniil Jarykaou Joachim Bienvenüe |
 | Ireland Online Team Leaders Andrea Visentin | Mykyta Telychko Afric Deasy Séamas Riordan Ben Maguire |
 | Italy On-site Team Leaders Lorenzo Ferrari Fabrizio Brioni | Sofia Maragò Nicholas Bamber Matteo Artale Matteo Cappiello Giovanni Tasselli Miriam Pividori Marco Gambaro Giovanni Maiellaro |
 | Luxembourg On-site Team Leaders Pascal Zeihen Laura Shaw Barragán | Sophie Zeihen Alex Avila González Adrian Maurice Mai Tudor Paltanea Marwan Lamesch Ferenc Ban Anne Banthrongsakd |
 | Netherlands On-site Team Leaders Thijs Marinussen Wendoline Timmerman | Karel Hofman Jelte Loeve Gideon Beerens Niek Van Delft Alina Cairan Ju Zoe Yao |
 | Portugal On-site Team Leaders Pedro Ribeiro Vasco Cruz | Luís Morais Anton Gavrilov David Montenegro Luís Dias Diogo Rosado Alexandre Rodrigues Lília Abraços |
 | Spain On-site Team Leaders Amal Dokkar El Hamoudi Manuel Torres Cid | Andrii Basov Guillem Vizcarro Sánchez Del Valle David Lago Alonso Daniel Simon Carpenter Ricardo Batanero Moranchel Rodrigo Nieto Petinal Vera Morancho Bargas Ariadna Puertas Caballero |
 | Switzerland On-site Team Leaders Ferdinand Ornskov Leo Chen | Jonathan Braun Aliaksei Badnarchuk Laetitia Sophia Orglmeister Myriam Faltin Jovian Soejono Máté Makai Andrej Ševera Hongjia Meng |
 | United Kingdom On-site Team Leaders Richard Forster Sam Trajtenberg | Daphne Carmesin Yuvan Raja Andrew Hsu Alexa Lee Ananya Bhadra Tvisha Shah |
Schedule
| Day | Time | Activity | Location |
|---|---|---|---|
| June 26th (Friday) | 13:00 – 19:00 | Arrivals Registration | Youth Hostel |
| 19:00 – 22:00 | Dinner Activities | Youth Hostel | |
| June 27th (Saturday) | 07:00 – 08:00 | Breakfast | Youth Hostel |
| 08:00 – 09:00 | Walk to contest hall | ||
| 09:00 – 11:00 | Practice contest | LGL | |
| 11:00 – 13:00 | Lunch | LGL | |
| 13:00 – 18:00 | Contest | LGL | |
| 18:00 – 19:00 | Walk back to hostel | ||
| 19:00 – 22:00 | Dinner Activities | Youth Hostel | |
| June 28th (Sunday) | 07:00 – 09:00 | Breakfast | Youth Hostel |
| 09:00 – 12:00 | Closing ceremony | Sang & Klang | |
| 12:00 – 14:00 | Lunch (hostel) | Youth Hostel | |
| 14:00 – 22:00 | Activities Departures | Youth Hostel |
Environment
All contestants must participate using the same contest environment: a virtual machine which is mandatory to be running on their personal laptop.
This is the lastest official virtual machine.
All contestants must be running from within this VM.
A guide to install and use the virtual machine can be found here.
Attention: This virtual machine has internet restricted to only allow access to the contest platform.
Regulations
Contributors
This year’s olympiad was made possible thanks to the contributions of:
| Host contributors | Luca Courte Laura Shaw Pascal Zeihen |
| Scientific contributors | Daniel Murphy Damien Leroy Suneet Mahajan Luca Versari Jelmer Firet Félix Moreno Peñarrubia Cheng Zhong Hugo Peyraud-Magnin Erekle Roinishvili Jeroen Krijgsman |
| Technical contributors | Luca Versari Jacobo Vilella Eljakim Schrijvers |
| Design contributors | Eljakim Schrijvers |
| Communication contributors | Jacobo Vilella |