The Missionary Oblates of Mary Immaculate (OMI) is a missionary religious congregation in the Catholic Church. It was founded on January 25, 1816, by Eugène de Mazenod, a French priest later recognized as a Catholic saint. The congregation was given recognition by Pope Leo XII on February 17, 1826. As of January 2020, the congregation was composed of 3,631 priests and lay brothers usually living in community. Their traditional salutation is Laudetur Iesus Christus, to which the response is Et Maria Immaculata. Members use the post-nominal letters, "OMI".

The Notre Dame University, also referred to by its acronym NDU, is a private Catholic research basic and higher education institution run by the Missionary Oblates of Mary Immaculate in Cotabato City, Philippines. It was founded by the Oblates in 1948 and has been a member of the Notre Dame Educational Association, a group of schools in the Philippines named Notre Dame. The Association is under the patronage of the Blessed Virgin Mary.