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".

Eugène de Mazenod, OMI was a French aristocrat and Catholic bishop. Mazenod founded the congregation of the Missionary Oblates of Mary Immaculate.