The University of Denver (DU) is a private research university in Denver, Colorado, United States. Founded in 1864, it had an enrollment of approximately 6,600 undergraduate students and 6,200 graduate students in 2024. It is classified among "R1: Doctoral Universities – Very high research spending and doctorate production". The 125-acre (0.51 km2) main campus is a designated arboretum and is located five miles (8 km) south of downtown Denver.