OBOceanoBrazilian Ocean Olympiad
Registrations (open to schools and general public) · Jun 8 – Sep 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
September 2026
9 dates
ONEENational Energy Efficiency Olympiad
Registration (done by schools) · Jun 8 – Sep 15, 2026
SMETASMETA Olympiads
Registrations for SMETA Olympiads · Aug 25 – Oct 25, 2026
CSOClimateScience Olympiad
Global semifinals and finals · Sep 1 – Oct 31, 2026
OBSUSBrazilian Sustainability Olympiad
Single-phase online exam · Sep 1–5, 2026
ONEENational Energy Efficiency Olympiad
Phase 1 exams and gamified challenges · Sep 4–25, 2026
ONCNational Science Olympiad
Announcement of Phase 2 qualifiers · Sep 10, 2026
ONCNational Science Olympiad
Phase 2 · Sep 17–18, 2026
OBOceanoBrazilian Ocean Olympiad
Knowledge category exams · Sep 24–26, 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.