These are contests that are available to anyone interested in participating.
Information incorrect or outdated? Want to add your favorite contest here? Send an e-mail to the webmaster.
| Contest | Information | Levels |
| ALA-LA-MISS Written math contest | comments@mathleague.com, http://www.mathleague.com/ | Grades 4-12 |
| AMC 8, AMC 10, AMC 12, AIME | http://amc.maa.org/ | Grades 8-12 |
| ARML | http://www.arml.com/ | Grades 8-12 |
| Log1 Contest | http://log1.wamath.net/ | Gtades 9-12 |
| Mandlebrot Competition | http://web.mandelbrot.org/ | Grades 8-12 |
| Math Olympiads | http://www.moems.org/ | Grades 4-8 |
| MATHCOUNTS | http://www.mathcounts.org/ | Grades 6-8 |
| Moody's Mega Math Challenge | http://m3challenge.siam.org/ | Grades 11-12 |
| Mu Alpha Theta National Convention | http://www.mualphatheta.org/ | Grades 9-12 |
| Purple Comet | http://purplecomet.org/ | Grades 6-12 |
| USAMTS | http://www.usamts.org/ | Grades 6-12 |