- Maria Black
- Maria Dalgarno
- Maria Renate
- Maria Theresa
- Marie Peeters-Ney
- Marie-Claire Di Carlo
- Markelle, M.Ed., M.A.
- Mary Beth Bracy
- Mary Ellen Tardif-Douglas
- Mary Woodard
- Matthew Marquardt
- Matthew Marquardt
- Maurice Baring
- Meaghen Hale
- Michael Coren
- Michael D. O'Brien
- Michael Thompson
- Mike Schramm
- Miriam Westen
- Moran Vitoria Wortman
- Msgr. Ronald A. Knox
- Nikola Vanderheyden
- Orestes Brownson
- Pater Ignotus
- Pater Peregrinus
