The University of Dayton (UD) is a private, Catholic research university in Dayton, Ohio. Founded in 1850 by the Society of Mary, it is one of three Marianist universities in the nation and the second-largest private university in Ohio. The university's campus is in the city's southern portion and spans 388 acres on both sides of the Great Miami River.The campus is noted for the Immaculate Conception Chapel and the University of Dayton Arena.
In the fall of 2020, the university enrolled 11,347 full-time students from a variety of religious, ethnic, and geographic backgrounds. It offers more than 80 academic programs in arts and sciences, business administration, education and health sciences, engineering and law. In 2009, UD offered what it believes to be one of the first undergraduate degree programs in human rights.It is classified among "R2: Doctoral Universities – High research activity".