mariza_CY's blog

2025 OIs: Everything we know so far
By mariza_CY, history, 4 weeks ago, In English

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

IOI 2025

Location: Garcilazo Sports Complex, Sucre, Bolivia
Dates: July 27-August 3, 2025

Websites:

IIOT 2025

Location: Budapest, Hungary
Dates: May 30-June 3, 2025

Websites:

Europe

EGOI 2025

Location: Bonn, Germany
Dates: July 14-20, 2025

Websites:

WEOI 2025

Location: Volterra, Italy
Dates: June 27-29 2025

Websites:

BalkOI 2025

Location: Italy (?)
Dates: September (?)

CEOI 2025

Location: Cluj-Napoca, Romania (?)
Dates: July 7-13, 2025 (?)

BaltOI 2025

Location: Toruń, Poland (?)
Dates: April 24-29, 2025 (?)

Junior

EJOI 2025

Location: Azerbaijan (?)

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:

PS. Good luck to everyone participating in their country's national olympiad!

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4 weeks ago, # |
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Azerbaijan is host country for EJOI 2025.

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4 weeks ago, # |
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APIO 2025 — Xishan, Jiangsu, China

CNOI 2025 — Shaoxing, Zhejiang, China

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    4 weeks ago, # ^ |
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    Bruh APIO is hosted by China again? I hope it's not like last year

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      4 weeks ago, # ^ |
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      you bro donot sleep

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        4 weeks ago, # ^ |
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        I slept around 11 PM and woke up around 8 AM

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          4 weeks ago, # ^ |
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          what are you going to do now?

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            4 weeks ago, # ^ |
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            I solved a problem and now I'm going to the gym

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              4 weeks ago, # ^ |
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              but it's too early and friday

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                4 weeks ago, # ^ |
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                Even better

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                  3 weeks ago, # ^ |
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                  What a chad, I'd love to have your discipline

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    4 weeks ago, # ^ |
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    Thanks! I added APIO.

    What's CNOI?

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      4 weeks ago, # ^ |
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      The national OI contest in China. Participants have to get good results in this year's CNOI to enter China Team Training&Selection for IOI'26.

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        4 weeks ago, # ^ |
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        Oh, OK. Thanks for mentioning it. I'm not going to add national olympiads, since the list would end up way too long, though.

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    4 weeks ago, # ^ |
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    Note that we only know Chinese students will take part in APIO 2025 in Xishan, Jiangsu. It does not mean APIO 2025 will be hosted by China. In fact, it's likely not to be hosted by China, since the host country changes every two years.

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      4 weeks ago, # ^ |
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      Thanks for letting me know. I'll remove this for now (unless fft_ntt, or any other user, has any information on this).

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        3 weeks ago, # ^ |
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        ok sry, it's held in Uzbekistan. My bad, I thought the announcement of Chinese division was the global announcement.

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          3 weeks ago, # ^ |
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          It's fine, such mistakes are expected especially considering that info about some OIs is often hard to find or uncertain. That's why I made sure to mark unofficial info with (?).

          I'll update the blog soon, thanks!

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4 weeks ago, # |
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China Win IOI2025

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4 weeks ago, # |
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WEOI 2025 will be held in Volterra, Italy on 27th-29th June 2025.

[call for tasks here]

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    4 weeks ago, # ^ |
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    Thanks! Added.

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    4 weeks ago, # ^ |
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    Bro, how many european contests are there?

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      4 weeks ago, # ^ |
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      There's also Baltic and Western European — basically 4 reagional plus EJOI, EGOI and junior regionals.

      They're a lot, but few countries are actually eligible to participate in more than 4: regional, junior regional, EJOI and EGOI.

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4 weeks ago, # |
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The Baltic OI will be held in Toruń, Poland on the 24th-29th of April. And the CEOI will be held in Cluj-Napoca, Romania on the 7th-13th of July.

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4 weeks ago, # |
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The 2025 edition of IIOT will take place between May 30 and June 3 in Hungary.

If your country wants to participate to the contest, you can check out the instructions here.

You can check the past problems here

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3 weeks ago, # |
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NAOI 2025 Location: Algeria (online) Dates: April 19th 2025

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3 weeks ago, # |
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Indian National Olympiad in Informatics, 2025 (INOI-2025) to be held on Sunday, 9th February 2025 from 2PM — 5PM.

Reference: https://www.iarcs.org.in/inoi/current.php#ico2025

Please update this data too on your blog.

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    3 weeks ago, # ^ |
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    Thanks, however, as I mentioned in the blog, I prefer not to add national OIs

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      3 weeks ago, # ^ |
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      I understand your decision. Still, I would request to consider listing national Olympiads too as not all of the listings currently accept worldwide participation. So, if Europe, Asia and Africa level entries have made it to the list, then within these continental categories you may list the national regions as well.

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        3 weeks ago, # ^ |
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        The reason I don't add national OIs is not because not every country can participate but because it would be way too long, so it would be hard for me to update and for everyone to use.

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7 days ago, # |
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The 2025 ICPC World Finals will be held in Azerbaijan.

  • August 31 — September 5
  • Baku, Azerbaijan
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    6 days ago, # ^ |
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    Thanks, but I don't plan on adding ICPC (its format is much different than the format of an OI, plus it's one of the most organized programming competitions I know, I think, so there's no reason to have it here).

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