Northern Arizona University (NAU) is a public research university in Flagstaff, Arizona, United States. Founded in 1899, it was the third and final university established in the Arizona Territory. The university is divided into seven academic colleges offering about 130 undergraduate and graduate programs, and various academic certificates. Students can take classes and conduct research in Flagstaff, online, and at more than 20 statewide locations, including the Phoenix Biomedical Core research campus. As of fall 2023, 28,194 students were enrolled with 21,550 at the Flagstaff campus. Northern Arizona University is one of the three universities governed by the Arizona Board of Regents and is accredited by the Higher Learning Commission.