National Math Contests
- American Mathematics Competitions: http://www.unl.edu/amc/
- USA Mathematical Talent Search: http://www.usamts.org/
- Mu Alpha Theta: http://www.mualphatheta.org/
- Mandelbrot: http://www.mandelbrot.org/
- National Assessment & Testing Math Contests: http://www.natassessment.com/
- International Mathematics Olympiad (IMO): http://olympiads.win.tue.nl/imo/ and http://imo.math.ca/
- Canadian Mathematical Society Competitions: http://www.cms.math.ca/Olympiads/
- Math Competitions on the Web: http://donut.math.toronto.edu/~naoki/math-comp.htm
- MATHCOUNTS: http://www.mathcounts.org/