- M.A.
- M.Afr.
- M.C.
- M.C.C.J.
- M.C.D.P.
- M.C.M.
- M.C.S.T.
- M.F.I.C.
- M.F.V.A.
- M.H.S.H.
- M.I.
- M.I.C.
- M.J.C.
- M.M.S.
- M.O.P.
- M.R.
- M.S.
- M.S.A.
- M.S.B.T.
- M.S.C.
- M.S.C.S.
- M.S.F.
- M.S.F.S.
- M.S.S.
- M.S.S.P.
- M.S.U.
- M.SS.C.
- M.T.
- Maas, Anthony J
- Mabillon, Jean
- Macarius, Saint
- Macau, China, diocese of
- MacCarthy, Denis Florence
- MacCuilenan, Cormac
- MacDonald, John
- MacDonell, Alexander
- mace
- Macedonianism
- Macedonio Melloni
- Machabees
- Machabees, The
- Machabeus, Judas
- MacHale, John
- Machar, Saint
- Machiavelli, Nicolo
- Mackenzie-Fort Smith, Canada, diocese of
- MacMahon, Marie Edmé Patrice Maurice de
- MacSherry, Richard
- Madang, Papua New Guinea, archdiocese of
- Madeleine de la Peltrie
- Madeleine Sophie Barat, Saint
- Madison, Wisconsin, diocese of
- Madonna
- Madras and Mylapore, India, archdiocese of
- Madrid, Spain
- Maelmhaedhoc O’Morgair
- Maestro di Camera del Papa
- Magaud, Antoine Dominique
- Magdala
- Magdeburg, Centuriators of
- Magdeburg, Germany, diocese of
- Magdalens
- Magellan, Ferdinand
- magi
- magic
- Magin Catalá
- Maginulf
- Magisterium
- Magna Carta
- magna, cappa
- Magnae Deus Potentie
- magnanimity
- Magnificat, The
- Magnus, Olaus
- Magog
- Maguire, John Aloysius
- Magus, Simon
- Magyarok Vasarnapja
- Mahoney, Francis Sylvester
- Mai, Angelo
- Maid of Kent
- Maier, Johann
- Maillard, Antoine Simon
- Mailros, Chronica de
- main altar
- Maine
- maintenance, church
- Maintenon, Françoise, Marquise de
- Mainz, Alban of, Saint
- Mainz, Germany, city of
- Mainz, Germany, diocese of
- Maisonneuve, Paul de Chomedey de
- Maistre, Joseph Marie de, Count
- Maistre, Xavier de
- Maitland-Newcastle, Australia, diocese of
- Majella, Gerard, Saint
- Majesty, Catholic
- majordomo
- Maker of All, Eternal King
- Maker of Man, Who from Thy Throne
- Malabar Rites
- Malachias
- Malachy, Saint
- Malagrida, Gabriel
- Malchus
- Maldonado, Juan
- Malebranche, Nicolas
- malediction
- malice
- Mallard, Ernest François
- Mallinckrodt, Hermann von
- Mallinckrodt, Pauline von
- Mallory, Stephen Russell
- Malmesbury, England
- Malory, Thomas
- Malpighi, Marcello
- Malta country
- Malta, archdiocese of
- Malta, Knights of
- Maltese cross
- Malvinas
- Mambre, Vale of
- Mame, Alfred Henri Amand
- Mamertine Prison
- Mamertus, Saint
- mammon
- man
- Man of Sin
- Man of Sorrows
- Man, Son of
- Manahen, Saint
- Manasses
- Mance, Jeanne
- Manchester, New Hampshire, diocese of
- Mandeville, Jean de
- Manes
- Mangalore, India, diocese of
- Mangan, James Clarence
- Manhattan College
- Mani
- Manichaeism
- Manichaeus
- manifestation of conscience
- Manila Observatory
- Manila, Philippine Islands, archdiocese of
- maniple
- Manius Glabrio
- mankind, resurrection of
- Mann, Horace K
- manna
- manna oil of saints
- Manning, Henry Edward
- Mannyng, Robert
- Manresa, Spain
- Mansard, Jules Hardouin
- Mansard, Nicolas Francois
- mantellate
- mantelletta
- mantum
- Manu, Laws of
- Manuel Chrysoloras
- manuscripts, illuminated
- manuterge
- Manutius, Aldus
- Manzoni, Alessandro
- Map, Walter
- mappa mundi
- Marcelino Menendez y Pelayo
- Marcellian, Saint
- Marcellina, Saint
- Marcellinus, Pope Saint
- Marcellinus, Saint
- Marcello Cervini degli Spannochi
- Marcello Malpighi
- Marcellus I, Pope, Saint
- Marcellus II, Pope
- March
- Marchand, Joseph, Blessed
- Marchi, Giuseppe
- Marcian
- Marcin Bielski
- Marcin Wolski
- Marcion
- Marcionites
- Marco Antonio de Dominis
- Marcoux, Joseph
- Marcus Aurelius Antoninus
- Marcus Aurelius Valerius Maxentius
- Marcus Aurelius Valerius Maximianus Herculius
- Mardin, Iraq, archdiocese of
- Mardin, Iraq, diocese of
- Mardin and Amida, Iraq, archdiocese of
- Margaret, Saint
- Margaret Hallahan
- Margaret Haughery
- Margaret Mary Alacoque, Saint
- Margaret Pole, Blessed
- Margaret of Cortona, Saint
- Margaret of Scotland, Saint
- Margli, Antonio, Venerable
- Marguerite Bourgeoys, Venerable
- Maria
- Maria Anne Fitzherbert
- Maria Camera
- Maria castis osculis
- Maria-Laach
- Maria Magdalena Bentivoglio
- Maria of Jesus
- Maria Theresa
- Marian Priests
- Mariana, Juan
- Marianists
- Mariano Rampolla del Tindaro
- Mariannhill, South Africa, diocese of
- Maribor, Slovenia, archdiocese of
- Marie Antoinette
- Marie de l’Incarnation, Blessed
- Marie de MacMahon
- Marie de Montijo de Guzman Eugénie
- Marie de Rabutin Chantal, Marquise de Sevigne
- Marie Flourens
- Marie Guyard
- Marie Lataste
- Marie Martin
- Marina de Escobar, Venerable
- Marinus I, Pope
- Marinus II, Pope
- mariolatry
- Mariology
- Mariotte, Edme
- Marisco, Adam de
- Mariscotti, Hyacintha, Saint
- Marist Fathers
- Marist School Brothers
- Marius, Saint
- Mark, Pope Saint
- Mark, Saint evangelist
- Mark, Saint martyr
- Mark, Gospel of Saint
- Mark, Liturgy of Saint
- marks of the Church
- Maronite Congregation of Aleppo
- Maronite Liturgy
- Maronites
- Maronites of the Baladite Congregation
- Maronites of the Congregation of Saint Isaias
- Marquette League
- Marquette University
- Marquette, Jacques
- Marquette, Michigan, diocese of
- marriage by proxy
- marriage without a priest
- marriage, dissolution of a
- marriage, indissolubility of
- marriage, levirate
- marriage, mixed
- marriage, morganatic
- Marriage, mystical
- marriage, putative
- Marsh, Adam
- Marshall Hall
- Marshall, Arthur Featherstone
- Marshall, Thomas
- Marshall, Thomas William
- mart.
- Martel, Charles
- Martene, Edmond
- Martha, Saint 19 Jan
- Martha, Saint 29 Jul
- Martin I, Pope Saint
- Martin II, Pope
- Martin III, Pope
- Martin IV, Pope
- Martin V, Pope
- Martin Luther
- Martin Martini
- Martin McMahon
- Martin of Tours, Saint
- Martin Waldseemuller
- Martin, Felix
- Martina, Saint
- Martinae celebri plaudite nomini
- Martini, Martin
- Martinian, Saint
- Martinmas
- martyr
- Martyr d’Anghiera, Peter
- Martyr Dei Venantius
- Martyr of God, Whose Strength was Steeled
- Martyr, Edmund the, Saint
- Martyr, Edward the, Saint
- Martyr, Justin, Saint
- martyrdom, instruments of
- martyrologies
- Martyrology, American
- Martyrs of Corfu
- Martyrs of Cuncolim
- Martyrs of Gorkum
- Martyrs of Uganda
- Martyrs, Acts of the
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- Martyrs, Carthusian
- Martyrs, English
- Martyrs, Forty
- Martyrs, Irish
- Mary
- Mary Anne de Paredes, Blessed
- Mary Guise
- Mary Hardey
- Mary Magdalen, Saint
- Mary Magdalen de’ Pazzi, Saint
- Mary Magdalen in art
- Mary Magdalen of the Sacred Heart of Jesus
- Mary Magdalen Postel, Saint
- Mary Magdalena Bentivoglio
- Mary Mediatrix
- Mary of Cleophas, Saint
- Mary of Egypt, Saint
- Mary of the Gael
- Mary Sadlier
- Mary Stuart
- Mary Tudor
- Mary, Children of
- Mary, Little Company of
- Mary, mediatrix of all graces
- Mary, name of
- Mary, Psalter of
- Mary, Queen of Scots
- Mary, Society of
- Mary’s Lent
- Marygrove College
- Maryhelp abbey
- Maryknoll
- Maryknoll House of Studies
- Maryland
- Marymas
- Marymount College
- Marywood University
- Masci, Girolamo
- Maseru, Lesotho, archdiocese of
- Masonry
- Masons
- Mass
- Mass dials
- Mass of requiem
- Mass of the Pre-sanctified
- Mass penny
- Mass priest
- Mass, Chapter
- Mass, Children’s
- Mass, Conventual
- Mass, Cross
- Mass, Cursal
- Mass, Field
- Mass, High
- Mass, hunter’s
- Mass, Low
- Mass, Midnight
- Mass, nuptial
- Mass, parochial
- Mass, Pontifical
- Mass, Proper of the
- Mass, Red
- Mass, Saints of the
- Mass, Secret in the
- Mass, Solemn
- Massa Candida
- Massachusetts
- Masse, Enemond
- Massillon, Jean Baptiste
- Massorah
- Massys, Quentin
- Master and Lord
- Master of Arts
- master of ceremonies
- master of novices
- Master of the Sacred Palace
- Master of the Sentences
- master, novice
- Master, The
- Mateo Aimerich
- Mater Admirabilis
- materialism, matter and
- Maternity of the Blessed Virgin Mary, Feast of the
- Matha, John of, Saint
- mathematics
- Mathew, Theobald
- Mathias Sarbiewski
- Mathusala
- Matilda, Saint
- Matilda von Hackeborn-Wippra, Saint
- Matins
- matrimonial court
- matrimonial separation
- matrimonial unworthiness
- matrimonium non consummatum
- Matrimony
- Matris sub almae numine
- Matsys, Quentin
- Matteo Colombo
- Matteo of Bascio
- Matteo Ricci
- matter and form
- matter and materialism
- matter, sacramental
- Matteucci, Carlo
- Matthew of Westminster
- Matthew Parker
- Matthew, Saint
- Matthew, Gospel of Saint
- Matthias, Saint
- Matthias Corvinus
- Maumere, Indonesia, diocese of
- Maundy Thursday
- Mauretania
- Maurice and Companions, Saint
- Maurice Bourdin
- Maurice Jean de Broglie
- Maurists, The
- Mauritania
- Mauro, Fra
- Maurus, Saint
- Maurus, Rabanus, Blessed
- Maury, Jean Siffrein
- mausoleum
- Max Müller
- Maxentius, Marcus Aurelius Valerius
- Maximilian I
- Maximilian Hell
- Maximilian of Antioch, Saint
- Maximilian the Great
- Maximinus, Gaius Valerius Galerius
- Maxims of the Fathers
- Maximus of Constantinople, Saint
- Maxwell, James Clerk
- May
- May Laws
- Maya Indians
- Mayer, Christian
- Mayer, Julius Robert
- Mayne, Cuthbert, Blessed
- Maynooth College
- Maynooth Mission to China
- Maynooth’s Catechism
- Mayo, School of
- Mazarin, Jules
- mazza
- Mazzella, Camillo
- mazzi
- McCarthy, Justin
- McCloskey, John
- McLoughlin, John
- McMahon, Martin Thomas
- Meade, John
- meals, grace at
- mean, golden
- means
- meat
- Meath, Ireland, diocese of
- Meatless Sunday
- mechanicism
- mechanism
- Mechtilde, Saint
- Medal of Saint Benedict
- Medal of Saint Christopher
- Medal, Mendel
- Medal, Miraculous
- medal, scapular
- Medals, Benemerenti
- medals, religious
- Medardus, Saint
- Mediana Sunday
- Mediator
- medical science
- Medici, Catherine de’
- medicine and canon law
- meditation
- medium
- meekness
- Meinrad, Saint
- Meister Johann Eckhart
- Mel, Saint
- Melaka-Johor, Malaysia, diocese of
- melancholy
- Melanchthon, Philipp
- Melania the Younger, Saint
- Melbourne, Australia, archdiocese of
- Melchiades, Pope Saint
- Melchior Cano
- Melchisedech
- Melchites
- Melchizedek
- Melchus, Saint
- Meliorism
- Melita
- Melkites
- Melleray
- Mellifont, abbey of
- Melloni, Macedonio
- Melrose, abbey of
- Melrose, Chronicle of
- Membré, Zenobius
- Memento rerum Conditor
- Memlinc, Hans
- Memling, Hans
- memoria
- memorial brasses
- Memoriam, In
- Memphis, Tennessee, diocese of
- menaion
- Menard, René
- Menas, Saint
- Mendel Medal
- Mendel’s Law
- Mendel, Gregor Johann
- mendicant friars
- Menendez y Pelayo, Marcelino
- Menevia, Wales, diocese of
- Mennas, Saint
- Mennonite bodies
- Menochio, Giovanni Stefano
- menologe
- menologium
- menology
- Menominee Indians
- mensa
- mensal revenue
- mental reservation
- Menthon, Bernard of, Saint
- Mephistopheles
- Mercedarians
- merchant guilds
- Mercier, Désiré Joseph
- Mercier, Louis Honoré
- mercy
- mercy seat
- mercy, corporal and spiritual works of
- Mercy, Mother of
- Mercyhurst College
- Merici, Angela, Saint
- Merida, Eulalia of, Saint
- merit
- Meru, Kenya, diocese of
- mesmerism
- Mesopotamia
- Messalians
- Messenger from God’s High Throne, The
- Messenger of the Sacred Heart, The
- Messias
- Messingham, Thomas
- metal-work in the service of the Church
- metaphysics
- Metastasio
- metempsychosis
- methodical mental prayer
- Methodist bishop
- Methodist bodies
- Methodist Episcopal Church
- Methodist Episcopal Church, South
- Methodist Protestant Church
- Methodius, Saint
- metropolitan
- Metropolitan and City Police Catholic Guild
- Metsys, Quentin
- Metuchen, New Jersey, diocese of
- Metz, Amalarius of
- Metz, Arnulf of, Saint
- Metz, France, diocese of
- Mexicali, Baja California Norte, Mexico, diocese of
- Mexico
- Mezzofanti, Giuseppe
- Mgr.
- Miami, Florida, archdiocese of
- Miao, India, diocese of
- Michael, Saint
- Michael O’Loghlen, Sir
- Michael Quin
- Michael the Archangel
- Michaelmas Day
- Micheas
- Micah
- Michael Faraday
- Michael Servetus
- Michel Benoit
- Michel Chasles
- Michel Le Tellier
- Michelangelo Buonarroti
- Michigan
- Michigan, University of
- Middle Ages
- Middlemore, Humphrey, Blessed
- Middlesbrough, England, diocese of
- Midnight Mass
- Midrashim
- Miecislas Halka Ledochowski
- Mighty, Dervel the
- Migne, Jacques Paul
- Miguel de Cervantes Saavedra
- Miguel de Molinos
- Milan, Ateneo of
- Milan, Edict of
- Milan, Italy
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- Milanese Rite
- Miles, George Henry
- military chaplain
- Military Order of Alcantara
- Military Order of Aviz
- Military Order of Calatrava
- Military Services, USA, archdiocese of
- milk and honey
- Millet, Jean Francois
- Milner, John
- Miltiades, Pope Saint
- Milvian Bridge
- Milwaukee, Wisconsin, archdiocese of
- Milwaukee, Wisconsin, city of
- Mincius, John
- Mind of the Church
- mineralogy
- Minims, Order of
- minister
- Minnesota
- Minor Orders
- Minories, The
- minster
- Minucius Felix
- miracle
- miracle of grace
- miracle plays
- miracles of Christ
- Miraculous Medal
- Miris modis repente liber, ferrea
- Mirror of Justice
- Misebicors, Joannes, Saint
- miserere
- mishna
- Misrule, Lord of
- Miss.
- Missa cantata
- Missa venatoria
- missal
- Missal, Arbuthnott
- Missal, Bobbio
- mission
- Mission House, Apostolic
- Mission Indians of California
- Mission of Our Lady of the Rosary
- mission of Padong, Bhutan, India
- Mission San Francisco de Asis de los Dolores
- Mission Workers of the Sacred Heart
- Mission, Sarayacu
- Missions Etrangeres de Paris
- Missionaries of Africa
- Missionaries of La Salette
- Missionaries of Our Lady of Africa of Algeria
- Missionaries of Saint Francis de Sales of Annecy
- Missionaries of the Company of Mary
- Missionaries of the Consolata of Turin
- Missionaries of the Sacred Heart of Jesus of Issoudun
- Missionaries, Montfort
- Missionary Oblates of Mary Immaculate
- Missionary Poor Clares of the Immaculate Conception
- Missionary Servants of the Most Holy Trinity
- Missionary Sisters, Servants of the Holy Ghost
- Missionary Sisters at Saint Columban
- Missionary Sisters of Our Lady of Africa
- Missionary Sisters of the Immaculate Conception
- Missionary Sisters of the Sacred Heart
- Missionary Society of Saint Paul the Apostle
- Missionary Sons of the Immaculate Heart of Mary
- missions, California
- Mississippi
- Missouri
- Misteca
- Mithraism
- mitre
- mixed marriage
- mixed religion
- Mixteca
- MM.
- Moab
- Moabite Stone
- Moabites
- Mobile, Alabama, archdiocese of
- Mochonna, Saint
- Mochuda, Saint
- Mochumna, Saint
- Modalist Monarchianism
- Modern Pilgrim’s Progress
- Modernism
- modesty
- modus vivendi
- Mohammed
- Mohammedanism
- Mohawks
- Möhler, Johann Adam
- Moliere
- Molina, Luis de
- Molinism
- Molinos, Miguel de
- Molloy, Gerald
- Moloch
- Molokai
- Molyneux, Robert
- monachism
- Monaco, country / archdiocese
- Monarchianism
- monasteries, double
- monasteries, Scoto-Hibernian
- monasteries, suppression of
- monastery
- monastery, canonical erection of
- Monastic school of Aran
- monasticism
- Monchua, Cronan, Saint
- Monday, Lort
- Monday, Plough
- Monday, Plow
- Monica, Saint
- monile
- monism
- Monita Secreta
- Monitor, The
- monk
- Monks, White
- monograms
- Monophysites
- Monophysitism
- monopoly
- monopoly, moral aspects of
- monotheism
- Monothelites
- Monothelitism
- Monrovia, Liberia, archdiocese of
- Monsabré, Jacques Marie Louis
- Monseigneur
- Monsignor
- monstrance
- Mont-Laurier, Quebec, Canada, diocese of
- Montalembert
- Montallegro
- Montana
- Montanists
- Montcalm, Louis Joseph Gozon, Marquis de
- Monte Giorgio, Ugolino of
- Monte Puloiano, Angiolo de’ Ambrosini da
- Montecorvino, John of
- Montefalco, Clare of, Saint
- Montenegro
- Montepulciano, Agnes of, Saint
- Monterey, California, diocese of
- montes pietatis
- Montfort Missionaries
- Montfort, Louis Marie Orignion de
- month of July
- month of June
- Month’s Mind
- Montmagny, Charles Huault de
- Montmartre
- Montreal, Quebec, Canada, archdiocese of
- Montreal, Quebec, Canada, city of
- Montreal, University of
- Montserrat
- monumental brasses
- Moor, Benedict the, Saint
- Moore, Arthur, Count
- Moore, Thomas
- Moors
- moral aspects of monopoly
- moral duty
- moral good
- moral sense
- moral theology
- moralities
- morality
- Moramanga, Madagascar
- Moran, Patrick Francis
- Moravian Church
- Moray, Scotland, diocese of
- Morgagni, Giovanni Battista
- morganatic marriage
- Moriscos
- Morison, James
- Mormons
- Morn Had Spread Her Crimson Rays, The
- Morning Star
- Morning Star, The
- Morocco
- Morogoro, Tanzania, diocese of
- morse
- mortal sin
- mortification
- mortmain
- mortuarium
- mosaic
- Mosaic Legislation
- Moses
- Moshi, Tanzania, diocese of
- Mossul, Iraq, archdiocese of
- Most Catholic King
- Most Christian King
- Most Faithful King
- Most High
- Most Blessed Trinity, scapular of the
- Most Holy Directing Synod
- Mote and the Beam, The
- Mother
- Mother Francis Raphael
- Mother Mary Joseph of Jesus
- Mother Mary! at thine altar
- Mother of God
- Mother of Mercy
- Mothering Sunday
- Motherwell, Scotland, diocese of
- motive
- Motu Proprio
- Mount Angel College and Seminary
- Mount Athos
- Mount Carmel
- Mount Carmel, Feast of Our Lady of
- Mount Carmel, scapular of
- Mount Hermon
- Mount Olivet
- Mount Melleray Abbey
- Mount Nebo
- Mount of Beatitudes
- Mother of Good Counsel, scapular of the
- Mount of Evil Counsel
- Mount of Offense
- Mount of Olives Witnesseth, The
- Mount Paran
- Mount Saint Bernard College
- Mount Saint Charles College
- Mount Saint Clare College
- Mount Saint Clare Junior College and Academy
- Mount Saint Joseph Abbey
- Mount Saint Joseph College
- Mount Saint Joseph on the Ohio
- Mount Saint Joseph, College of
- Mount Saint Joseph’s College
- Mount Saint Mary’s College, Derbyshire
- Mount Saint Mary’s College, Los Angeles
- Mount Saint Mary’s Seminary
- Mount Saint Mary’s Seminary of the West
- Mount Saint Mary’s University
- Mount Saint Vincent, College of
- Mount Sinai
- Mount Tabor
- Mount Thabor
- Mount, Sermon on the
- Mountain, White
- movable feasts
- Moxos Indians
- Moyes, James
- Moyos
- Mozarab
- Mozarabic Rite
- mozzetta
- Mullanphy, John
- Mullany, Patrick Francis
- Müller, Johann
- Müller, Johannes Peter
- Müller, Karl
- Müller, Max
- Mullingar, Ireland
- Mundi, Cursor
- mundi, mappa
- Mungo, Saint
- Munich and Freising, Germany, archdiocese of
- Muñoz, Gil Sanchez
- Münster, Germany, city of
- Münster, Germany, diocese of
- Muratori, Luigi Antonio
- Muratorian Canon
- murder, ritual
- Murillo, Bartolomé Estéban
- Murphy, John Benjamin
- Murray, Patrick
- Murray, Thomas Edward
- Murska Sobota, Slovenia, diocese of
- music, ecclesiastical
- music, Passion
- mustard seed
- Muvattupuzha, India, eparchy of
- Mwanza, Tanzania, archdiocese of
- My God, I love Thee not because
- My God, My God, why hast thou forsaken me
- My Jesus! say what wretch has dared
- Myles O’Reilly
- Myra
- Myra, Nicholas of, Saint
- myrrh
- Mysore, India, diocese of
- mysteries
- mystery plays
- Mystical Body of Christ
- mystical marriage
- mystical numbers
- Mystical Rose
- mystical theology
- mysticism
- mythology
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