IMO Problems - With solutions, collected by John Scholes.
4th International Conference of The World Federation of National Mathematics Competitions - Melbourne, 4-10 August 2002
Kalva - Complete set of all International Mathematical Olympiad problems from the 1st IMO 1959 to date, with solutions. Also includes a large set of Russian Olympiad problems and Putnam problems.
Math League - Runs maths contests and sells problem books and math educational software.
Math Olympiads in Peru - A history with links to related competitions.
Flanders Mathematics Olympiad - Arrangements for the competition, posters and lists of questions (English/Flemish).
Mathematics Competitions - Mathematics competitions archive. Crux mathematicorum online.
UK Mathematics Trust - Mathematics competitions in the UK for 12-18 year old school pupils, ranging from popular mass "challenges" to the selection and training of the International Mathematical Olympiad (IMO) team.
Mathematical Challenge - A problem solving competition for individual pupils in Scottish secondary and upper primary schools.
Math Competitions on the Web - A collection of links to mathematics competitions all around the world
Mathematics Olympiad Lecture Notes - Notes for lectures Greg Gamble gave during 1995 to highschool students intending to participate in Mathematics Olympiads.
IMO and Other Competitions - Past International Mathematical Olympiads and links to web sites related to various regional and national math competitions
USA Mathematical Talent Search (USAMTS) - The USAMTS is a free mathematics competition available to all high school students in the United States. Students may enter the competition at any time of the academic year.
International Mathematical Talent Search - A competitive year-round correspondence program in creative mathematical problem solving at the secondary school level. It is open to all students in every country at no cost.
USSR Math Olympiad, 1961-1986 - Problems without solutions.
Irish Mathematics Intervarsities - Annual event competed in by teams from different universities throughout Ireland.
The Mickey Mouse Math Club - The Club is a forum for the Singapore International Math Olympiad training squads. Non-members are welcome; bring your own problems.
American Mathematics Competitions - Organization that administers the AMC, the AIME, and the USAMO, with information about the contests, math problem archives, recommended reading lists, and other resources for students interested in mathematics.
Math Olympiad Problems Database - Database of 5,000 math olympiads problems from various countries.
Dutch Mathematics Olympiad - Introduction and information on the Dutch Olympiad including contact details. Problems and solutions are listed in Dutch language only.
The Mandelbrot Competition - Includes introduction to contest, news, memos, resources and on-line registration.
Jeffrey Lockshin's Olympiad Math Madness - Collection of mathematical problems, invented for mathematical olympiads the world over
Malaysian participation in the IMO - Statistics, some problems and solutions
Math Olympiad Problems from Around the World - In particular, from Iran.
International Space Visualization Olympiad - Competition in Visualization on Polyhedra - solve a labyrinth on the surface of many different polyhedra.
IMO and National Olympiads - Information on past and future competitions, competing countries, exam problems and related materials.
Math Olympiad Learning Center - Monthly internet mathematics olympiad from February to July. Tutorials and articles in elementary mathematics, a collection of math problems including some problems from NZ math competitions.
Norwegian Mathematical Olympiad - Also known as the Niels Henrik Abel Contest. Problems and results.
Mathcounts - The (American) national math coaching and competition program for 7th and 8th grade students.
IMO 1998 - 39th International Mathematical Olympiad, Taipei, Taiwan; 10--21 July 1998.
IMO Network - Mailing lists for participants of the International Mathematical Olympiads.
Math Competitions in USA - Sample problems and links.
IMO 2001 - 42nd International Mathematical Olympiad, 1-14 July, Washington, DC USA. Problems and official scores
Kiran Kedlaya's Math Competitions Archive - US Mathematical Olympiad (1989-1999) without solutions, and William Lowell Putnam Competition (1987-1998), some with solutions.
Irish Mathematical Olympiad - for high school students. Team lists, old problems and training details.
Resources from UK Math Olympiads - Problems from UK Math Olympiads and a collection of training materials
Moldavian Mathematical Olympiads - History and problem lists.
International Mathematics Tournament of Towns - A mathematics problem solving competition in which towns throughout the world can participate on an equal basis. Students participate in their own towns which involves minimal transport and administrative costs.
CMS Competitions - Concours de la SMC - Canadian Open Mathematics Challenge, Canadian Mathematical Olympiad, Asian Pacific Mathematics Olympiad.
IMC (International Math Competition) for University Students - The IMC (International Math Competition) for university students is the premier event of its type.
Belgian Mathematical Olympiad (BMO) - History and problem sets.
Math Olympiad for Elementary Schools - Resources for school mathematics clubs and competitions. Primarily aimed at US schools.
International Space Visualisation Olympiad - Izidor Hafner's space visualization olympiad and rhombic polyhedra.
The Indian MO-Cell Homepage - Headquarters of all mathematics olympiad related activity in India.
SMS: Singapore Mathematical Olympiad - Rules and results.
IMO 1995 - 36th International Mathematical Olympiad. Toronto, 13 - 25 July 1995.
South Africa and the International Mathematical Olympiad - Results, links, training guides and materials.
Mathematics Olympiad Discussion Forum - Yahoo club with mailing list and chat.
IMO 1997 - 38th International Mathematical Olympiad, Mar del Plata, Argentina, July, 1997. Problems, solutions, results.
A Collection of Math-Olympiad-Problems - Problems from various math olympiads collected by Hans Vernaeve.
IMO Webpage - Maintained by Hojoo Lee: IMO problems, short-listed problems and links.
Mathematics Archives - Mathematics Contests, Competitions and Problem Sets
Countries with Olympiad Sites - Links to Mathematical Olympiad Websites.
IBM Research Ponder This - A monthly on-line competition matching wits with "some of the best minds in IBM Research".
Madras College Mathematics Department Resources - Assortment of materials. Includes British Mathematics Olympiad papers.
IMO 2002 - 43d International Mathematics Olympiad, 19-31 July, Glasgow, Scotland. The official site with materials about British Mathematics Olympiads