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
March 2026
26 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
ACSLAmerican Computer Science League
Regular season Contest 2 · Jan 5 – Mar 1, 2026
ACSLAmerican Computer Science League
Regular season Contest 3 · Feb 2 – Apr 5, 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
Scratch OlympiadInternational Scratch Creative Programming Olympiad
Registrations and project submission – Selection stage · Mar 1 – Jun 30, 2026
ACSLAmerican Computer Science League
Regular season Contest 4 · Mar 2 – May 17, 2026
ONIANational Artificial Intelligence Olympiad
2nd ONIA – Phase 3, stage 1 (online exam) · Mar 2–5, 2026
OBBBrazilian Biology Olympiad
Phase 1 · Mar 3, 2026
OBRBrazilian Robotics Olympiad
Registration – Practical category · Mar 12 – Apr 30, 2026
OBRBrazilian Robotics Olympiad
Registration – Theoretical category · Mar 12 – Jun 12, 2026
Reply ChallengeReply Challenges (Code & Cyber Security)
Hack the Code Challenge (Standard and Teen editions) · Mar 12, 2026
OBFEPBrazilian Public School Physics Olympiad
School accreditation/registration (extended; done by the teacher in charge) · Mar 14 – Jun 1, 2026
OBQJrBrazilian Junior Chemistry Olympiad
Registration · Mar 16 – May 20, 2026
OBBBrazilian Biology Olympiad
Phase 2 · Mar 18, 2026
CanguruKangaroo Math Brazil
Exam (official date 19/03; alternative dates 20 to 25/03) · Mar 19–25, 2026
OBIBrazilian Olympiad in Informatics
Registration – Introductory category · Mar 25 – May 26, 2026
OBIBrazilian Olympiad in Informatics
Registration – Programming category (reopened until 17/06 for Session B) · Mar 25 – Jun 17, 2026
USACOUSA Computing Olympiad
US Open – Season championship contest · Mar 27–30, 2026
OBMBrazilian Mathematical Olympiad
Registration – 5th Jacob Palis Júnior Competition (qualifier for the OBM, Levels 1, 2 and 3) · Mar 30 – May 20, 2026
OBMBrazilian Mathematical Olympiad
Registration – 7th Elon Lages Lima Competition (University Level Phase 1) · Mar 30 – May 20, 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.