| International Mathematical Olympiad (IMO) |
International |
High school (national teams) |
July |
Annual |
Top international high-school olympiad; national selection required |
| European Girls’ Mathematical Olympiad (EGMO) |
International (Europe & invitees) |
High school girls |
April |
Annual |
Encourages female participation in olympiad maths |
| China Girls’ Mathematical Olympiad (CGMO) |
International (China-hosted) |
High school girls |
April 6 |
Annual |
Girls-only contest with international invitees |
| Asia Pacific Mathematics Olympiad (APMO) |
Asia-Pacific |
High school (national teams) |
March–6April |
Annual |
Regional team-based olympiad; national selection |
| Mathematical Contest in Modeling (MCM/ICM) |
International (university teams) |
University (Undergraduate) |
February |
Annual |
Team modelling competition for university students |
| International Mathematical Modeling Challenge (IMMC) |
International |
High school teams |
Varies (often April) |
Annual |
Team modelling contest for high-school students |
| Mathematical Kangaroo (Kangourou) |
International (via national organisers) |
Primary to secondary (age divisions) |
March |
Annual |
Large participation across many countries |
| Tournament of the Towns |
International (origin Russia) |
School-level (various ages) |
Autumn & Spring rounds |
Biannual (two rounds) |
Long-standing international problem-solving competition |
| Purple Comet! Math Meet |
International (online/team) |
Middle & High School Teams |
Spring (Apr) |
Annual |
Free online team contest |
| Balkan Mathematical Olympiad (BMO) | Balkan countries | High school | April | Annual | Regional olympiad for Balkan nations |
| Baltic Way | Baltic Sea region | High school (team) | May | Annual | Team-based contest |
| Pan African Mathematical Olympiad (PAMO) | Africa | High school (national teams) | June–6July | Annual | Continental African olympiad |
| Nordic Mathematical Contest (NMC) | Nordic countries | High school | Varies | Annual | Nordic regional contest |
| UKMT Primary Mathematics Challenge (PMC) | UK | Primary (Key Stage 2) | November | Annual | School-based entry; broad participation |
| UKMT Junior Mathematical Challenge | UK | Ages ~11–613 | November | Annual | Follow-on rounds: JMO, etc. |
| UKMT Intermediate Mathematical Challenge | UK | Ages ~13–616 | February | Annual | Follow-ons: Kangaroo, Olympiad rounds |
| UKMT Senior Mathematical Challenge | UK | Ages ~16 618 | Oct–6Nov | Annual | Leads to BMO selection |
| British Mathematical Olympiad (BMO 1 & 2) | UK | Senior olympiad pathway | Dec–Mar | Annual | BMO1 then BMO2; selection for IMO team |
| Math League | USA | Elementary to high school (divisions) | Multiple windows (school year) | Annual | Regional and national levels |
| MATHCOUNTS | USA | Middle school (Grades 6 68) | Feb 6May (chapter/state/national) | Annual | In-school and team rounds leading to nationals |
| AMC 8 | USA | Middle school (up to Grade 8) | February | Annual | Multiple-choice gateway contest |
| AMC 10 | USA | High school up to Grade 10 | Nov & Feb windows | Annual | Qualifies top scorers to AIME |
| AMC 12 | USA | High school up to Grade 12 | Nov & Feb windows | Annual | Qualifies top scorers to AIME |
| AIME | USA | Invited from AMC scores | Feb–6Mar | Annual | Invitation-only; leads to USAMO/USAJMO selection |
| USAMO / USAJMO | USA | Top AIME scorers (olympiad level) | Apr–6May | Annual | National olympiad competitions; IMO team pathway |
| ARML (American Regions Mathematics League) | United States | High school teams | June | Annual | Team contest with regional teams |
| HMMT (Harvard-MIT Mathematics Tournament) | United States (invited/registered) | High school | Nov & Feb editions | Annual | Prestigious invitational contest |
| Canadian Open Mathematics Challenge (COMC) | Canada | High school | November | Annual | Gateway to Canadian olympiad pipeline |
| Canadian Mathematical Olympiad (CMO) | Canada | High school (national) | Spring | Annual | National olympiad; selection for IMO |
| CEMC contests (University of Waterloo) | Canada | Grades 7 612 and university | Sept–6Nov | Annual | Multiple contests across levels (Gauss, Pascal, Cayley, Fermat) |
| Australian Mathematics Competition (AMC – AMT) | Australia (and international entries) | Primary to secondary (divisions) | August | Annual | Large international participation; school-based |
| Australian Mathematical Olympiad (AMO) | Australia | High school (olympiad pathway) | Feb–6 Mar | Annual | Selection for IMO training |
| Primary / Regional Mathematics Contests | india | Primary to high school | Varies (academic year) | Annual | Many state-level and school contests |
| PRMO / IOQM / INMO / RMO (India olympiad pipeline) | India | High school olympiad pipeline | Aug 6Feb (varies by stage) | Annual | Multi-stage selection for IMO |
| Chinese Mathematical Olympiad (CMO) | China | High school (national) | December (varies) | Annual | Culmination of provincial selection processes |
| Singapore Mathematical Olympiad (SMO) | Singapore | Junior & Senior divisions (school age) | May– 6June | Annual | National olympiad organized by Singapore Mathematical Society |
| SASMO (Singapore & Asian Schools Math Olympiad) | International (Asia-based) | Primary–Secondary | May | Annual | School-level competition across Asia |
| Malaysian Mathematical Olympiad (MMO) | Malaysia | High school | May– 6July | Annual | National selection for international contests |
| Thailand Mathematics Olympiad (TMO) | Thailand | High school | Spring | Annual | National selection and training pipeline |
| Vietnam National Mathematical Olympiad (VNMO) | Vietnam | High school | Spring | Annual | National olympiad and selection event |
| Japan Mathematical Olympiad (JMO) | Japan | High school | Winter/Spring (varies) | Annual | Multi-stage national olympiad |
| Korea Mathematical Olympiad (KMO) | South Korea | High school | Year-round stages | Annual | Multi-stage selection with training camps |
| Romanian Master of Mathematics (RMM) | Romania (international invitational) | Top high school teams | February | Annual | Elite invitational tournament |
| European Mathematical Cup (EMC) | Europe (invitational) | High school | Autumn | Annual | Advanced individual contest |
| Bebras Challenge | International (computational thinking) | Primary–Secondary | November | Annual | Computational thinking challenge |
| MOEMS (Mathematical Olympiads for Elementary and Middle Schools) | International/US | Grades 4–68 | Oct 6Mar (levels) | Annual | Problem-solving for younger students |
| Noetic Learning Math Contest | US & Canada | Grades 2–68 | Multiple windows (school year) | Annual | Primary/middle school contest focusing on problem-solving |
