The American Regions Mathematics League (ARML), is an annual high school mathematics team competition held simultaneously at three locations in the United States: the University of Iowa, Penn State, and Las Vegas. Past sites have included San Jose and at Duke University.
Teams are comprised of 15 members, which usually represent a large geographic region (such as a state) or a large population center (such as a major city). Some math and science magnet schools, such as Thomas Jefferson High School for Science and Technology, VA, and the Academy for the Advancement of Science and Technology (AAST), NJ, also field teams. The competition is held on the first Saturday after Memorial Day.
As of 2006, the number of teams competing at ARML is over 100 and the number of student around 1800.
ARML problems cover a wide variety of mathematical topics including algebra, geometry, number theory, combinatorics, probability, and inequalities. While part of the competition is short-answer based, there is a proof-based team round. ARML problems are harder than at most high school mathematics competitions.