M
- Macedonian Orthodox Church
- Major archbishop
- Malabar Independent Syrian Church
- Malankara Jacobite Syriac Orthodox Church
- Mar Thoma Church
- Mark the Evangelist
- Maron, John
- Maronite Church
- Metropolitan Cornelius
- Miaphysitism
- Middle East Council of Churches
- Monolithic church
- Monophysitism
- Mount Athos
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