St. John's University is a private Catholic university in Queens, New York City. It was founded in 1870 by the Congregation of the Mission with a mission to provide the youth of New York with a Catholic university education. Originally located in the Brooklyn borough of New York City, the flagship campus was moved to its current location in the Queens borough during the 1950s. St. John's has an additional New York City campus in Manhattan. The university’s Staten Island campus closed in May of 2024. Additionally, the university has international campuses located in Rome, Italy, Paris, France, and Limerick, Ireland.

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.