Arizona State University (ASU or Arizona State) is a public research university located in the Phoenix Metropolitan Area of the U.S. state of Arizona. With a 2011 enrollment of 72,254, it is the largest public university in the United States by enrollment.

Founded in 1885 as the Tempe Normal School for the Arizona Territory, the school came under control of the Arizona Board of Regents in 1945 and was renamed Arizona State College. A 1958 statewide ballot measure gave the university its present name.

ASU awards bachelors, masters, and doctoral degrees, and is broadly organized into 14 divisions spread across four campuses: the original Tempe campus, the West campus in northwest Phoenix, the Polytechnic campus in eastern Mesa, and the Downtown Phoenix campus. All four campuses are accredited as a single institution by the Higher Learning Commission.

ASU's athletic teams compete in Division I of the NCAA and are collectively known as the Arizona State Sun Devils. They are members of the Pacific-12 Conference and have won 23 national championships.

Arizona (ⁱ/ɛrɪˈzoʊnə/; /ærɪˈzoʊnə/) (Navajo: Hoozdo Hahoodzo; O'odham: Alĭ ṣonak) is a state of the United States, located in the southwestern region of the country. Arizona is also part of the Western United States and of the Mountain West states. Arizona is the sixth most extensive and the 16th most populous of the 50 states. Its capital and largest city is Phoenix. The second largest city is Tucson, followed in population by eight cities of the Phoenix metropolitan area: Mesa, Chandler, Glendale, Scottsdale, Gilbert, Tempe, Peoria, and Surprise.

Arizona is the 48th state and last of the contiguous states to be admitted to the Union, and it achieved statehood on February 14, 1912. Arizona is noted for its desert climate in its southern half, where there are very hot summers and quite mild winters. The northern half of Arizona also features forests of pine, Douglas fir, and spruce trees, a very large, high plateau (the Colorado Plateau) and some mountain ranges—such as the San Francisco Mountains—as well as large, deep canyons, where there is much more moderate weather for three seasons of the year, plus significant snowfalls. There are ski resorts in the areas of Flagstaff and Alpine.

A state university system in the United States is a group of public universities supported by an individual state, or a similar entity such as the District of Columbia. These systems constitute the majority of public-funded universities in the country. Each state supports at least one such system.

Federal funded colleges and universities are limited to military personnel and government employees. Members of foreign militaries and governments also attend some schools. These schools include the United States military academies, Naval Postgraduate School, and military staff colleges.

A state university system normally means a single legal entity and administration, but may consist of several institutions, each with its own identity as a university. Some states—such as California and Texas—support more than one such system.

State universities get subsidies from their states. The amount of the subsidy varies from university to university and state to state, but the effect is to lower tuition costs below that of private universities. As more and more Americans attend college, and private tuition rates increase well beyond the rate of inflation, admission to state universities is becoming more and more competitive.