Encyclopedias, Almanacs, Transcripts, and Maps
- Marty, Martin
- Martyrdom, Theology of
- Martyrium
- Martyrologies
- Martyrology of St. Jerome
- Martyrology, Roman
- Marulić, Marko
- Maruthas of Martyropolis
- Maruthas of Tagrit
- Marwa, Muhammad (D. 1980)
- Marwan (623–685 C.E.)
- Marwick, Lawrence
- Marx, Adolf Bernhard
- Marx, Alexander
- Mary (In Catholic-Protestant Dialogue)
- Mary de Cervellón, St.
- Mary Immaculate, Sisters Servants of
- Mary Magdalene, St.
- Mary of Egypt, St.
- Mary of Oignies, Bl.