Regional mathematics competitions

* AITMO (Asian Inter-city Teenagers Mathematics Olympiad) — for junior secondary students around the Eastern Asian region
* APMO (Asian Pacific Mathematics Olympiad) — Pacific rim
* Balkan Mathematical Olympiad — for students from 15.5 years old from Balkan area
* Baltic Way — Baltic area
* ICAS-Mathematics (http://www.eaa.unsw.edu.au/about_icas/mathematics, formerly Australasian Schools Mathematics Assessment)
* Junior Balkan Mathematical Olympiad — for students under 15.5 years old from Balkan area
* MEMO (Middle European Mathematical Olympiad) — Germany, Croatia, Austria, Poland, Switzerland, Slovakia, Slovenia, Czech Republic, Hungary
* NMC (Nordic Mathematical Contest) — the five Nordic countries
* Nordic university-level mathematics team-competition — For Nordic undergraduates (http://cc.oulu.fi/~phasto/competition/)
* OIM (Olimpíadas Iberoamericanas de Matemática) — Spain, Portugal and Latin America (http://www.oei.es/oim/index.html)
* Olimpiada de mayo (competitions for selecting the participants of Olimpiada Matematica Rioplatence) (http://www.oma.org.ar/internacional/may.htm)
* Olimpiada Iberoamericana de Matematicas para Estudiantes Universitarios (similar to Olimpiada Iberoamericana de Matematica, but it is for collage students)
* Olimpiada Matematica Rioplatense (similar to Olimpiada Iberoamericana de Matematica, but it is every year in Argentina and participants are organized in levels depending on the age) (http://www.oma.org.ar/internacional/omr.htm)
* Olimpiada Matematica de Centroamérica y del Caribe — Central America and the Caribbean
* Olimpiada Matematica de Paises del Cono Sur — 8 countries from South America
* SEAMO (SEAMEO Mathematics Olympiad) — South-East Asia
* SEAMC (South East Asian Mathematics Competition) — South-East Asia (http://hseagle.sas.edu.sg/seamc/)
* William Lowell Putnam Mathematical Competition — USA and Canada (http://www.maa.org/awards/putnam.html)
* APMOPS (Singapore - Asia Pacific Mathematical Olympiad for Primary Schools) — open to Primary Students under 12 in Australia, Brunei, China (Shanghai, Hainan, Xiamen, Wenchou), Hong Kong, Indonesia (Jakarta), Malaysia: (Johor, Kuala Lumpur, Selangor- Petaling Jaya), Penang, Perak- Ipoh, Kedah), New Zealand, Singapore, South Korea, Taiwan, The Philippines & India. (http://www.hci.sg/aphelion/apmops/index.htm)
* ZIMO (Zhautykov International Mathematical Olympiad) — for teams from specialized schools in post-soviet region (http://izho2008.fiz-mat.kz/)
* Hungary-Israel Mathematical Competition. It was established in 1990. Only this 2 countries participate and one is the host. It is hold in spring. It consist of individual and team contests.
* Tuymaada Yakut Olympiad. Multidisciplinary competition for students from Romania, Kazakhstan, Moldova, Tartastan, Saint Petersburg, Irkutsk, Vladivostok, Novokuznetsk, Perm and other Russian cities. It is held in July; few students obtain prizes.
* Donova Mathematical Olympiad. Olympiad for all countries through which the Danube passes. Held since 2005.
* Mediterranean Mathematics Olympiad. Olympiad for countries in the Mediterranean zone.
* PAMO (Pan African Mathematics Olympiad)
* APMC (Austrian-Polish Mathematics Competition) (last held in 2006)
* Czech-Polish-Slovak Match. Established in 1995 under the name of Czech-Slovak Match Poland joined in 2001. It is held in June in the IMO format.