OBMBrazilian Mathematical Olympiad
Announcement of selected students and participation confirmation (invitees only) · Sep 7 – Oct 2, 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
October 2026
7 dates
OBMBrazilian Mathematical Olympiad
48th OBM – single phase (Levels 1, 2 and 3) and University Level Phase 2 (Level 1 on day 1 only) · Oct 8–9, 2026
TM²Girls in Mathematics Tournament (TM²)
Phase 2 Exam of the Girls in Mathematics Tournament · Oct 16, 2026
AMOAmerican Math Olympiad (AMO)
American Math Olympiad Official Contest · Oct 17–19, 2026
OBMEPBrazilian Public School Mathematics Olympiad
Phase 2 (Saturday, 14h30, Brasília time) · Oct 17, 2026
PAGMOPan-American Girls' Mathematical Olympiad
Competition · Oct 18–24, 2026
CIIMIbero-American Interuniversity Mathematics Competition
Competition · Oct 26–31, 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.