ISEFRegeneron International Science and Engineering Fair (ISEF)
Fair (international final) · May 8–14, 2027
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 2027
9 dates
This month, no set day · announcements and estimates
IPOInternational Philosophy Olympiad
Competition · usually held in May · 2027
OBABrazilian Astronomy and Astronautics Olympiad
Exam (30th OBA) · usually held in May · 2027
OBAFOGBrazilian Rocket Olympiad (formerly MOBFOG)
Launch deadline · usually held in May · 2027
OBLBrazilian Linguistics Olympiad
Phase 1 (month announced by OBL; day to be announced) · no date forecast yet · 2027
OBNBrazilian Brain Bee (OBN)
National Finals of the Brazilian Brain Bee · usually held in May · 2027
OBRACBrazilian Cartography Olympiad
Stage I – online theory exam · usually held in May · 2027
ONHBNational Olympiad in Brazilian History
Online phases begin · usually held in May · 2027
VANDAVanda International Science Competition
Vanda International Science Competition Official Contest · usually held in May · 2027
No date yet in 2027 (11)
Cone SulSouthern Cone Mathematical Olympiad
Competition · no date forecast yet · 2027
IESOInternational Earth Science Olympiad
Competition · no date forecast yet · 2027
IJSOInternational Junior Science Olympiad
Competition · no date forecast yet · 2027
IOAAInternational Olympiad on Astronomy and Astrophysics
Competition · no date forecast yet · 2027
OIABIbero-American Biology Olympiad
Competition · no date forecast yet · 2027
OIAQIbero-American Chemistry Olympiad
Competition · no date forecast yet · 2027
OIMIbero-American Mathematical Olympiad
Competition · no date forecast yet · 2027
OIbFIbero-American Physics Olympiad
Competition · no date forecast yet · 2027
awaiting datesNo forecast
OLAALatin American Astronomy and Astronautics Olympiad
Competition · no date forecast yet · 2027
OMCPLPMathematical Olympiad of the Community of Portuguese-Speaking Countries
Competition · no date forecast yet · 2027
RMMRomanian Master of Mathematics
Competition · no date forecast yet · 2027
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.