Niagara University (NU) is a private Catholic university in Lewiston, New York, United States. Based in the Vincentian tradition, it is run by the Congregation of the Mission and enrolls approximately 3,700 students. Approximately half of the student body lives on campus, while the other half commute from the surrounding area. The campus area was listed as a census-designated place in 2020, with a population of 940.