Here is everything we know about the 2025 OIs so far (I'll update this whenever new information is announced):
Note: Information with (?) wasn't found in any official website and might be wrong.
Feel free to share information about other OIs (except national olympiads) in the comments and I'll add them.
UPD: Since the post was getting a bit messy, I grouped all the olympiads by region and whether they are a junior olympiad. I hope the new format is helpful.
International
IIOT 2025
Location: Budapest, Hungary
Dates: May 30-June 3, 2025
Websites:
- Official
- Main IIOT site (includes info on this year's edition)
IOI 2025
Location: Garcilazo Sports Complex, Sucre, Bolivia
Dates: July 27-August 3, 2025
Websites:
Europe
BaltOI 2025
Location: Faculty of Mathematics and Computer Science of Nicolaus Copernicus University, Toruń, Poland
Dates: April 24-29, 2025
Websites:
WEOI 2025
Location: Volterra, Italy (Hybrid)
Dates: June 27-29 2025
Websites:
CEOI 2025
Location: Cluj-Napoca, Romania (?)
Dates: July 7-13, 2025 (?)
EGOI 2025
Location: Bonn, Germany
Dates: July 14-20, 2025
Websites:
BalkOI 2025
Location: Udine, Italy
Dates: September 25-October 1, 2025
Websites:
Junior
EJOI 2025
Location: Shumen, Bulgaria
Dates: August 29-September 4, 2025
Websites:
JBOI 2025
Location: Cyprus
Dates: October 2025
Websites:
Asia & Oceania
APIO 2025
Location: Online
Organising country: Uzbekistan
Dates: May 17-18, 2025
Websites:
Africa
NAOI 2025
(This is the first edition of NAOI!)
Location: Online
Organizing country: Algeria
Dates: April 19, 2025
Websites:
PAIO 2025
(This is the first edition of PAIO!)
Location: Online
Organising country: Rwanda
Dates: September 12-14, 2025
Websites:
North & South America
OII 2025
Location: Online
Dates: June 14, 2025
Websites:
- Official OII site (info about individual OIIs is published here)
- Teams CF blog
PS. Good luck to everyone participating in their country's national olympiad!
