Francis Michael Duff, ' (7 June 1889 – 7 November 1980), known as Frank Duff, was known especially for bringing attention to the role of the Catholic Laity during the Second Vatican Council of the Roman Catholic Church as well as for founding the Legion of Mary in his native city of Dublin, Ireland.

Edel Mary Quinn, (14 September 1907 – 12 May 1944) known as Edel Quinn was an Irish-born Roman Catholic lay-missionary and Envoy of the Legion of Mary to East Africa

Alphonsus Lambe (Tullmore, Ireland, 24 June 1932 – Buenos Aires, Argentina, 21 January 1959) known as Alfie Lambe was an Irish-born Roman Catholic lay-missionary and envoy of the Legion of Mary to South America.