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
May 2026
39 dates
CSOClimateScience Olympiad
Online qualifying round (Qualifiers) · Jan 1 – Jun 10, 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
OBRBrazilian Robotics Olympiad
Registration – Theoretical category · Mar 12 – Jun 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
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
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
OBMEP MirimMirim Olympiad – OBMEP (grades 2 to 5)
Registration (done by schools) · Apr 28 – Jun 8, 2026
OBSUSBrazilian Sustainability Olympiad
Team registrations (free) · May 1 – Aug 23, 2026
Scratch MonthScratch Month (Scratch Month & Scratch Day)
Scratch Month – Global creative coding celebration · May 1–31, 2026
TJRYouth Robotics Tournament
Regional and state qualifying stages · May 2 – Oct 31, 2026
ONHBNational Olympiad in Brazilian History
Phase 1 · May 4–9, 2026
RobofestRobofest – International Autonomous Robotics Competition
Robofest World Championship · May 7–9, 2026
APIOAsia-Pacific Informatics Olympiad (APIO)
Asia-Pacific Informatics Olympiad Official Contest · May 9–10, 2026
ONHBNational Olympiad in Brazilian History
Phase 2 · May 11–16, 2026
EGOIEuropean Girls' Olympiad in Informatics
Competition · May 12–18, 2026
OBABrazilian Astronomy and Astronautics Olympiad
Exam (29th OBA) · May 15, 2026
OBAFOGBrazilian Rocket Olympiad (formerly MOBFOG)
Deadline to launch the rockets (20th OBAFOG) · May 15, 2026
DrCTDrCT – International Computational Thinking Olympiad
DrCT Official Contest (Design Thinking & Computational Thinking) · May 16–17, 2026
ONHBNational Olympiad in Brazilian History
Phase 3 · May 18–23, 2026
OBNBrazilian Brain Bee (OBN)
National Finals of the Brazilian Brain Bee · May 22–23, 2026
ACSLAmerican Computer Science League
ACSL Invitational Finals · May 23, 2026
VANDAVanda International Science Competition
Vanda International Science Competition Official Contest · May 23–24, 2026
ONHBNational Olympiad in Brazilian History
Phase 4 · May 25–30, 2026
OBIBrazilian Olympiad in Informatics
Phase 1 (Local) – Introductory category · May 27–29, 2026
OBMBrazilian Mathematical Olympiad
5th Jacob Palis Júnior Competition (qualifier for the OBM, Levels 1, 2 and 3) · May 29, 2026
OBMBrazilian Mathematical Olympiad
University Level Phase 1 (7th Elon Lages Lima Competition) · May 29, 2026
OBRBrazilian Robotics Olympiad
Practical category – In-person regional and state stages (window; dates vary by state) · May 29 – Sep 13, 2026
Pwn2WinPwn2Win CTF
Pwn2Win international offensive security competition · May 29–31, 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.