The Indian MO-Cell
- The headquarters of all Math olympiad related activity in India. Located at the Department of Mathematics of the Indian Institute of Science, Bangalore. Provides information on the Indian National Maths Olympiad and past contest problems.
- http://www.iisc.ernet.in/mocell/

UIUC Math Contests Webpage
- Information and resources for the Putnam and the UIUC Undergraduate Math Contest. Includes practice problems and solutions. Maintained by Professor A.J. Hildebrand.
- http://www.math.uiuc.edu/~hildebr/putnam/

UCT Mathematics Competition
- Rules, results, and training materials for the annual competition at the University of Cape Town.
- http://www.mth.uct.ac.za/competition/

Balkan Mathematical Olympiad
- Mathematical contest for school pupils from the countries situated in the Balkan region.
- http://bmo.ournet.md/

Polish Mathematical Olympiad
- Math olympiads for Polish high school students. Features problem archives from the Austrian-Polish Mathematics Competition, Baltic Team Contest, Poland Mathematical Olympiad.
- http://www.mimuw.edu.pl/~chel/Olimp/olympiads.html

South Africa and the International Mathematical Olympiad
- Results, links, training guides and materials.
- http://www.mth.uct.ac.za/imo/

Asian Pacific Mathematics Olympiad
- Competition regulations, past results, awards, and APMO Test Papers from 1989 to present.
- http://camel.math.ca/CMS/Competitions/APMO/

Bulgarian Competitions in Mathematics and Informatics
- Introduction to the major national competitions in Bulgaria. Features comprehensive sets of past contest problems.
- http://www.math.bas.bg/bcmi/

The Norwegian Mathematical Olympiad
- Mathematical problem solving contest named after the world famous Norwegian mathematician Niels Henrik Abel. Includes contest problems in downloadable format.
- http://www.math.uio.no/div/abelkonkurransen/

AMATYC Student Math League
- Series of mathematical contests organized by The American Mathematical Association of Two-Year Colleges (AMATYC).
- http://www.amatyc.org/SML/SML.html

The Continental Mathematics League and The National Olympiads
- CML offers a series of math meets for grades 2-9, a calculus league for the high school, and a Java computer contest.
- http://www.continentalmathleague.hostrack.com/

Math League
- Specializes in math contests, books, and computer software designed for students from the 4th grade through high school.
- http://www.mathleague.com

British Mathematical Olympiad
- The Subtrust (BMOS) and Committee (BMOC) pages with past problems.
- http://www.bmoc.maths.org/

Canadian Mathematical Olympiad (CMO)
- Include results, past problems and solutions.
- http://www.cms.math.ca/Competitions/CMO/

American Regions Math League (ARML)
- Results and past problems for the ARML, an annual national competition.
- http://www.arml.com/

Furman Mathematics Tournament
- Hosted by the Furman University. Site includes past results and written problems.
- http://math.furman.edu/tournament/tournament.html

Mathematical Challenge
- A problem solving competition for individual pupils in Scottish secondary and upper primary schools.
- http://www-maths.mcs.st-and.ac.uk/~smc/SMC_MC.html

Norwegian Mathematical Olympiad
- National contest for the selection of the Norway IMO team. Contains history and problems.
- http://www.math.uio.no/abelkonkurransen/

MathCounts
- United States national math coaching and competition program for middle school students.
- http://www.mathcounts.org/

Irish Mathematical Olympiad
- Team lists, old problems and training details for high school students.
- http://www.ul.ie/~maths/imo.htm

The Mandelbrot Competition
- Includes introduction to contest, news, memos, resources and on-line registration.
- http://www.mandelbrot.org/

Harvard-MIT Mathematics Tournament
- Annual math tournament for high school students, held at MIT and at Harvard in alternating years.
- http://web.mit.edu/hmmt/

Flanders Mathematics Olympiad
- Arrangements for the competition, posters and lists of questions (English/Flemish).
- http://www.kulak.ac.be/vwo/uk/vwowwwuk.html

Dutch Mathematics Olympiad
- Annual mathematics competition for high school students since 1962.
- http://olympiads.win.tue.nl/nwo/nwo-e.html

The Canadian Open Mathematics Challenge
- Qualifying round for the Canadian Mathematical Olympiad. Site includes registration and past problems.
- http://www.cms.math.ca/Competitions/COMC/

Canadian Mathematics Competition
- Organization that sponsors the Canadian Open Mathematics Challenge, the Euclid Contest, the Gauss Contest, with online workshop, problem archives, and other resources for students.
- http://www.cemc.uwaterloo.ca/

Redwood Empire Mathematics Tournament
- Annual event held at Humboldt State University for all middle and high schools students.
- http://www.humboldt.edu/~remt/

SMS: Singapore Mathematical Olympiad
- The largest and oldest mathematics competition in Singapore. Contains schuedule, results, rules, and photo gallery.
- http://sms.math.nus.edu.sg/competitions/CompetitionHomePage.aspx