Mathematics Olympiad Lecture Notes
- By Greg Gamble for highschool students intending to participate in Mathematics Olympiads.
- http://www.maths.uwa.edu.au/~gregg/Olympiad/

Ravi Vakil (Stanford)
- Training resources for the Putnam competition. Practice problems, notes on mathematical theories, and recommended reading.
- http://math.stanford.edu/~vakil/putnam03/

Problem Solving References & Resources
- Overview of seminars oriented towards problem solving. Includes sample problem sets, list of online resources, college mathematics journals, and useful books. Maintained by Andrew Bernoff (Harvey Mudd College).
- http://www.math.hmc.edu/~ajb/PCMI/problem_solve.html

Madras College Mathematics Department Resources
- Assortment of materials including British Mathematics Olympiad papers and Mathematics Higher Course Notes.
- http://www.users.zetnet.co.uk/madras/maths/resources.html

Greg Martin (UBC)
- Syllabus and practice problems from Rajiv Gupta and Greg Martin's Putnam practice sessions.
- http://www.math.ubc.ca/~gerg/teaching/putnam/