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
April 2026
15 dates
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
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
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
ONCNational Science Olympiad
Registration (updated deadline) · Apr 1 – Aug 24, 2026
OBQBrazilian Chemistry Olympiad
Online state qualifiers (except MG, SP and SE) – registration (qualify for the next national OBQ) · Apr 6 – May 29, 2026
OBFBrazilian Physics Olympiad
Registration (schools and students) and Phase 1 fee payment (extended) · Apr 7 – Jun 12, 2026
OBGBrazilian Geography Olympiad
Team registration (extended until 20/07) · Apr 9 – Jul 20, 2026
OBBBrazilian Biology Olympiad
Phase 3 (final exam, 10h Brasília time) · Apr 14, 2026
OBBBrazilian Biology Olympiad
Preliminary ranking and qualifiers for the international Training/Selection (from this date on) · Apr 16, 2026
OBMEP MirimMirim Olympiad – OBMEP (grades 2 to 5)
Registration (done by schools) · Apr 28 – Jun 8, 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.