ONCNational Science Olympiad
Registration (updated deadline) · Apr 1 – Aug 24, 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
August 2026
25 dates
OBSUSBrazilian Sustainability Olympiad
Team registrations (free) · May 1 – Aug 23, 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
IOLInternational Linguistics Olympiad
Competition · Jul 26 – Aug 2, 2026
IMCInternational Mathematics Competition for University Students
Competition · Jul 27 – Aug 3, 2026
Cone SulSouthern Cone Mathematical Olympiad
Competition · Aug 3–8, 2026
OBAFOGBrazilian Rocket Olympiad (formerly MOBFOG)
Rocket Days (16 groups; invited teams only) · Aug 3 – Dec 17, 2026
OBMEPBrazilian Public School Mathematics Olympiad
Announcement of Phase 2 qualifiers · Aug 3, 2026
OBGBrazilian Geography Olympiad
Online phase – Stage 1 · Aug 4–6, 2026
OBGBrazilian Geography Olympiad
Online phase – Stage 2 · Aug 11–13, 2026
iGeoInternational Geography Olympiad
Competition · Aug 11–17, 2026
OBFEPBrazilian Public School Physics Olympiad
Phase 1 · Aug 12, 2026
TM²Girls in Mathematics Tournament (TM²)
Phase 1 Exam of the Girls in Mathematics Tournament · Aug 14, 2026
OBGBrazilian Geography Olympiad
Online phase – Stage 3 · Aug 18–19, 2026
IESOInternational Earth Science Olympiad
Competition · Aug 20–27, 2026
OBQJrBrazilian Junior Chemistry Olympiad
Phase 2 (online) · Aug 21, 2026
OBFBrazilian Physics Olympiad
Phase 2 (in-person exam, 13h30–17h30 BRT; rescheduled from 15/08) · Aug 22, 2026
OBMEP MirimMirim Olympiad – OBMEP (grades 2 to 5)
Phase 1 · Aug 25, 2026
SMETASMETA Olympiads
Registrations for SMETA Olympiads · Aug 25 – Oct 25, 2026
OBFEPBrazilian Public School Physics Olympiad
Announcement of Phase 2 qualifiers (latest date) · Aug 27, 2026
ONCNational Science Olympiad
Phase 1 · Aug 27–29, 2026
OBQBrazilian Chemistry Olympiad
Phase III – in-person national exam, 14h–18h (students called up by the state coordinators) · Aug 28, 2026
ONHBNational Olympiad in Brazilian History
In-person National Final (exam on 29/08, awards on 30/08) · Aug 29–30, 2026
OIABIbero-American Biology Olympiad
Competition · Aug 30 – Sep 5, 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.