The Slaves of the Immaculate Heart of Mary (MICM) is a religious congregation founded in 1949 by Father Leonard Feeney and Brother Francis Maluf, based at the Saint Benedict Center in Richmond, New Hampshire. Dedicated to the propagation and defense of Catholic dogma, particularly the belief in no salvation outside the Church, their mission addresses both spiritual warfare and the conversion of America to Catholicism. The MICM includes religious brothers and sisters alongside a Third Order of laypeople living out their faith in the world.

Their educational initiatives comprise the Saint Augustine Institute of Wisdom and the running of Immaculate Heart of Mary School, focusing on apostolic formation and continuing Catholic education. The Congregation actively publishes materials, hosts an internet radio show called Reconquest, and engages the community through door-to-door outreach. Committed to fostering a robust Catholic culture, they strive to create an environment conducive to family life and spiritual growth while adhering to traditional liturgical practices, particularly the Extraordinary Form of the Mass