More than 20,000 mathematics contest problems and solutions

• American Regions Math League - Past problems and solutions.
• AMC 8 past problems and solutions.
• AMC 10 past problems and solutions.
• AMC 12/AHSME - 1512 problems with solutions.
• AIME -  585 problems with solution
• Canadian Mathematics Competitions. Past contest problems with solutions (600+ problems with solutions).
• Furman University Wylie Mathematics Tournament – Past tests and solutions.
• Great Plains Math League
• The Math Forum’s Problem of the Week
• Marywood High School Mathematics Contest – Problems and solutions from past contests.
• Mu Alpha Theta. A great collection of more than 10,000 high school problems with solutions.
• North Carolina State Mathematics Contests – Problems and solutions from past contests.
• Oklahoma State Math Contest – Past tests and solutions.
• Pomona College/Univ. of Wisconsin Talent Search – Past tests and solutions; challenging proof problems.
• Putnam Archive – Problems from the Putnam exam, the most significant collegiate math contest.
• Rocket City Math League
• Standford Mathematics Tournament
• Stetson University Math Contest - Problems and solutions (proofs).
• South Africa Math Olympiad
• Streamline School Annual Math Olympiad
• University of Maryland Math Contest – Past tests with solutions (some multiple choice, some proofs).
• University of North Carolina Charlotte High School Math Contest - Past tests with solutions.
• University of South Carolina High School Math Contest - Past tests with solutions (some of which are interactive).
• University of Tennessee Pro2Serve Math Contest – Past multiple choice and proof tests (no solutions).
• Utah State Math Contest – Past tests and solutions.
• UAB Math By Mail Contest – Past test.

INTERMEDIATE

• Wisconsin Mathematics, Engineering, and Science Talent Search - Past tests and solutions (primarily proofs).
• William Lowell Putnam Competitions – Problems with solutions (2004-present).
• The Mathematical Contest in Modeling
• International Mathematics Competition – Problems and Solutions
• USA International Math Talent Search
• USA Harvard-MIT Tournament
• USA Math Talent Search
• Junior Balkan Mathematics Olympiad
• Miklos Schwitzer Competition
• Iranian Mathematical Society

OLYMPIAD LEVEL

• International Mathematics Olympiad. One of the toughest and probably the most prestigious undergraduate competition in the world. (321 problems)
• IMO Shortlisted Problems.  from 1959-2009 (1201 problems)
• IMO Longlist. 1446 problems in 21 years.
• Asia Pacific Mathematics Olympiad
• Bay Area Mathematics Olympiad – Past + practice problems & solutions.
• Balkan Mathematics Olympiad – problems and solutions
• Baltic Way
• Benelux
• Colorado Mathematical Olympiad – Past problems and some solutions.
• CentroAmerican
• Cono Sur Olympiad
• Donova Mathematical Olympiad
• Hungary-Israel Binational
• IberoAmerican
• International Zhautykov Olympiad
• JBMO ShortLists
• Kazakhstan Intl
• Mediterranean Mathematics Olympiad
• Middle European Mathematical Olympiad
• Pan African
• Romanian Masters In Mathematics
• Tournament Of Towns
• Tuymaada Yakut Olympiad
• USAMO/IMO/APMO Index - Compilation of past USA Math Olympiad, International Math Olympiad, and Asian Pacific Math Olympiad problems.
• Famous Unsolved Math Problems

If you know more math problem solving and mot contest sites, email me at mathandmultimedia@gmail.com

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Photo Credit: Portrait of Genius by A.A.