Competition regions
Students across Greater China take part through their regional round — Chinese Mainland, Hong Kong, Macau and Chinese Taipei. Each region runs on its own schedule and selection; contact us for your region’s current dates and how to enter.
Chinese Mainland
The largest delegation in Greater China, with preliminary and national rounds.
Hong Kong SAR
An active scene — Hong Kong hosted the international finals in 2024 — running its own selection to the finals.
Macau SAR
A smaller regional round, arranged locally, feeding into the international finals.
Chinese Taipei
A separate selection that sends its own team on to the international finals.
Each region sets its own schedule, eligibility window and selection, and these change season by season. Rather than post dates that may go stale, we keep them current through direct contact — scan the QR below (or use Contact) and we’ll walk you through your region’s exact schedule and how to enter.
Each region publishes its own selection rules. For Chinese Mainland, The IEOC 2027 handbook lists an online Preliminary Round in December 2026, an Annual Summit in East China in spring 2027, and international opportunities in summer 2027. Exact dates, current entry deadlines and fees require the latest organiser notice.
What does a regional round involve?
Regional selection formats may differ from the international final. The IEOC 2027 handbook lists Junior-SL for G9 and below, entering individually or in teams of 3–5; Junior-HL and Senior for G9–G12, in teams of 3–5. Junior groups use Chinese and English; Senior uses English. These China programme rules do not replace the separate international-final eligibility regulations.
The IEOC 2027 handbook lists an online Preliminary Round in December 2026, an Annual Summit in East China in spring 2027, and international opportunities in summer 2027. Exact dates, current entry deadlines and fees require the latest organiser notice. The handbook gives Junior groups international invitation opportunities and Senior a national-team pathway. Use the current student handbook for the detailed qualification conditions.
One pathway, four regions
Each region runs its own round on the shared IEO format. Top performers are selected to represent their region, and go on to the global finals.
Same format everywhere
Every region uses the same three rounds — MCQ, open questions and a business case — so preparation transfers across regions.
Regional selection
Results in your regional round determine selection to represent your region at the international finals.
Global finals
Selected teams join contestants from 70+ countries at the annual international finals.
New to the format? Start with the Competition page, then see Registration.