OBSMABrazilian Health and Environment Olympiad
Project submissions – 13th edition (2025-2026), extended · Aug 18 – Jul 20, 2026
2026–2030 calendar
Competition calendar
Tech competitions highlighted (⚡), science olympiads, hackathons and more. Filter by age and click an event for details.
⚡ Upcoming tech dates
48h HackathonsMLH GHWOnline hackathon weekNov 6–12, 2026happening now</> ProgrammingBebrasWorld-Wide Bebras Week of computational thinkingNov 9–13, 2026happening now🔐 CybersecurityCSAWCSAW Cybersecurity Games Global FinalsNov 12–14, 2026in 2 days48h HackathonsJunctionHackathon (48 h)Nov 13–15, 2026in 3 days
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Long registration periods appear only on the days they open and close.
This month's competitions
February 2026
10 dates
CanguruKangaroo Math Brazil
Registration (done by schools) · Dec 1 – Mar 13, 2026
GENIUSGENIUS Olympiad
Registrations and environmental project submission · Dec 1 – Mar 7, 2026
CSOClimateScience Olympiad
Online qualifying round (Qualifiers) · Jan 1 – Jun 10, 2026
OBBBrazilian Biology Olympiad
Registration (done by schools) · Jan 15 – Feb 27, 2026
OBMEPBrazilian Public School Mathematics Olympiad
Registration (done by schools) · Feb 4 – Mar 16, 2026
ONHBNational Olympiad in Brazilian History
Team registration (extended until 27/04) · Feb 15 – Apr 27, 2026
OBABrazilian Astronomy and Astronautics Olympiad
Student registration (single OBA/OBAFOG registration) · Feb 23 – May 1, 2026
OBAFOGBrazilian Rocket Olympiad (formerly MOBFOG)
Registration (single OBA/OBAFOG registration) · Feb 23 – May 1, 2026
RMMRomanian Master of Mathematics
Competition · Feb 23–28, 2026
Confirmed: official days · Month announced: days to be confirmed · Estimate: the month it is usually held, not announced yet · No forecast: date unknown.
Dates checked on the organizers' official websites and calendars (last review on November 6, 2026). They may change: always confirm on the official website before registering or traveling.