Niagara University (NU) is a private Catholic university in the Vincentian tradition in the Census-designated place Niagara University, New York within the Town of Lewiston near Niagara Falls. It is run by the Congregation of the Mission and has approximately 3,300 undergraduate students in 50 academic programs. Approximately half of the students are residents 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.

The Congregation of the Mission, abbreviated CM and commonly called the Vincentians or Lazarists, is a Catholic society of apostolic life of pontifical right for men founded by Vincent de Paul. It is associated with the Vincentian Family, a loose federation of organizations that look to Vincent de Paul as their founder or patron.