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
June 2026
20 dates
CSOClimateScience Olympiad
Online qualifying round (Qualifiers) · Jan 1 – Jun 10, 2026
OBFEPBrazilian Public School Physics Olympiad
School accreditation/registration (extended; done by the teacher in charge) · Mar 14 – Jun 1, 2026
ONCNational Science Olympiad
Registration (updated deadline) · Apr 1 – Aug 24, 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
OBSUSBrazilian Sustainability Olympiad
Team registrations (free) · May 1 – Aug 23, 2026
CanguruKangaroo Math Brazil
Announcement of overall results · Jun 2, 2026
OBQJrBrazilian Junior Chemistry Olympiad
Phase 1 · Jun 3, 2026
GENIUSGENIUS Olympiad
International environmental project fair · Jun 8–12, 2026
OBOceanoBrazilian Ocean Olympiad
Registrations (open to schools and general public) · Jun 8 – Sep 20, 2026
ONEENational Energy Efficiency Olympiad
Registration (done by schools) · Jun 8 – Sep 15, 2026
ONHBNational Olympiad in Brazilian History
Phase 5 (State Final and National Semifinal) · Jun 8–13, 2026
OBMEPBrazilian Public School Mathematics Olympiad
Phase 1 · Jun 9, 2026
OBQBrazilian Chemistry Olympiad
Online state qualifiers (except MG, SP and SE) – exam, from 8h to 20h · Jun 12, 2026
OBFBrazilian Physics Olympiad
Phase 1 (online exam; 4 h window between 7h on 19/06 and 23h59 on 20/06) · Jun 19–20, 2026
ONHBNational Olympiad in Brazilian History
Announcement of teams called up for the National Final · Jun 19, 2026
ONHBNational Olympiad in Brazilian History
Announcement of state medalists · Jun 26, 2026
OBABrazilian Astronomy and Astronautics Olympiad
Announcement of medalists (OBA and OBAFOG) · Jun 30, 2026
OBFBrazilian Physics Olympiad
Publication of Phase 2 cut-off scores · Jun 30, 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.