List of former Catholic brothers

This is a list of notable former Roman Catholic religious brothers:
 * Rick Curry, SJ – was a Jesuit brother for 47 years before being ordained a priest in 2009 at the age of 66
 * Justo Gallego Martínez – Spanish former Trappist monk who left due to ill health; best known for his construction of an unfinished and unsanctioned cathedral in the Community of Madrid
 * Robert Hoatson – former Christian Brother and priest who left to become a sexual abuse victims activist
 * John Philip Holland – Irish engineer and developer of the first submarine of the United States Navy; was a member of the Congregation of Christian Brothers in his younger years before leaving in 1873 due to ill health
 * Guillaume Imbert – French writer; was forced by his parents to join a Benedictine monastery but left as soon as he could
 * Gabriel Moran – American theologian and religious educator; was a Brother of the Christian Schools from 1954–1985 when he left and married a woman
 * Trinidad Sanchez, Jr. – American poet; was a Jesuit brother for 27 years
 * William I of Berg – Count of Berg; former monk whose religious vows were absolved by the Pope so he could become count