- List of Contributors
- List of Illustrations
- Victor de Laprade
- Lapsi
- Ven. Luis de Lapuente
- Laranda
- Lares
- Armand de La Richardie
- Diocese of Larino
- Larissa
- Joseph de La Roche Daillon
- The Duke of La Rochefoucauld-Liancourt
- Henri-Auguste-Georges du Vergier, Comte de la Rochejacquelein
- Diocese of La Rochelle
- Dominique-Jean Larrey
- Charles de Larue
- Charles de La Rue
- La Salette
- Missionaries of La Salette
- René-Robert-Cavelier, Sieur de La Salle
- Ernst von Lasaulx
- Constantine Lascaris
- Janus Lascaris
- John Laski
- Baron Joseph Maria Christoph von Lassberg
- Orlandus de Lassus
- Marie Lataste
- Flaminius Annibali de Latera
- Christian Museum of Lateran
- Saint John Lateran
- Lateran Councils
- Ecclesiastical Latin
- Latin Church
- Christian Latin Literature
- Classical Latin Literature in the Church
- Brunetto Latini
- La Trappe
- Pierre-André Latreille
- Latria
- Lauda Sion
- Lauds
- Laura
- Pierre-Sébastien Laurentie
- Diocese of Lausanne and Geneva
- Jean de Lauzon
- Pierre de Lauzon
- Lavabo
- Diocese of Laval
- François de Montmorency Laval
- Jean Parisot de La Valette
- Laval University of Quebec
- Lavant
- Charles-Honoré Laverdière
- Pierre Gaultier de Varennes, Sieur de Lavérendrye
- Jean-Nicolas Laverlochère
- Charles-Martial-Allemand Lavigerie
- Antoine-Laurent Lavoisier
- Law
- Canon Law
- Influence of the Church on Civil Law
- Common Law
- Moral Aspect of Divine Law
- International Law
- Natural Law
- Roman Law
- St. Lawrence (2)
- St. Lawrence (1)
- St. Lawrence Justinian
- St. Lawrence O'Toole
- Lay Abbot
- Lay Brothers
- Lay Communion
- Lay Confession
- Paul Laymann
- Lay Tithes
- Lazarus
- Order of St. Lazarus of Jerusalem
- St. Lazarus of Bethany
- Diocese of Lead
- The League
- German (Catholic) League
- League of the Cross
- St. Leander of Seville
- Diocese of Leavenworth
- Lebanon
- Lebedus
- Edmond-Frederic Le Blant
- Charles Lebrun
- St. Lebwin
- Emile-Paul-Constant-Ange Le Camus
- Etienne Le Camus
- Joseph Le Caron
- Diocese of Lecce
- François Leclerc du Tremblay
- Chrestien Leclercq
- Lecoy de La Marche
- Claude Le Coz
- Lectern
- Lectionary
- Lector
- Miecislas Halka Ledochowski
- Diocese of Leeds
- Camille Lefebvre
- Family of Lefèvre
- Jacques Le Fèvre
- Guy Lefèvre de la Boderie
- Jacques Lefèvre d'Etaples
- Legacies
- Legate
- Literary or Profane Legends
- Legends of the Saints
- Diocese of Leghorn
- Legio
- Oliver Legipont
- Legists
- Legitimation
- Charles Le Gobien
- Louis Legrand
- Ven. Louise de Marillac Le Gras
- Arthur-Marie Le Hir
- Abbey of Lehnin
- The System of Leibniz
- Ven. Richard Leigh
- Leipzig
- University of Leipzig
- Diocese of Leitmeritz
- Jean Lejeune
- Jacques Lelong
- Louis-Joseph Le Loutre
- Diocese of Le Mans
- Lemberg
- Henry Lemcke
- François Le Mercier
- Jacques Lemercier
- Thomas de Lemos
- Le Moyne
- Simon Le Moyne
- Pierre-Charles L'Enfant
- Adam Franz Lennig
- Charles Lenormant
- François Lenormant
- Denis-Nicolas Le Nourry
- Lent
- Publius Lentulus
- Pope St. Leo I (the Great)
- Pope St. Leo II
- Pope St. Leo III
- Pope St. Leo IV
- Pope Leo V
- Pope Leo VI
- Pope Leo VII
- Pope Leo VIII
- Pope St. Leo IX
- Pope Leo X
- Pope Leo XI
- Pope Leo XII
- Pope Leo XIII
- Brother Leo
- St. Leocadia
- St. Leodegar
- Leo Diaconus
- Diocese and Civil Province of Leon
- Diocese of León
- Luis de León
- Leonard of Chios
- St. Leonard of Limousin
- St. Leonard of Port Maurice
- St. Leonidas
- St. Leontius
- Leontius Byzantinus
- Leontopolis
- Lepanto
- Leprosy
- Leptis Magna
- Diocese of Le Puy
- Michel Le Quien
- Diocese of Lérida
- Abbey of Lérins
- Leros
- Alain-René Le Sage
- Lesbi
- Marc Lescarbot
- Pierre Lescot
- Diocese of Lesina
- John Leslie
- Leonard Lessius
- Lessons in the Liturgy
- Louis-Henri de Lestrange
- François Eustache Lesueur
| - Lete
- Charles-Maurice Le Tellier
- Michel Le Tellier (1)
- Nicolas Letourneux
- Ecclesiastical Letters
- Leubus
- Leuce
- Michael Levadoux
- Louis Levau
- Urbain-Jean-Joseph Le Verrier
- Levites
- Leviticus
- Lex
- Juan Bautista de Lezana
- Michel de L'Hospital
- Libel
- Libellatici, Libelli
- Liberalism
- Libera Me
- Libera Nos
- Matteo Liberatore
- Liberatus of Carthage
- Liber Diurnus Romanorum Pontificum
- Liberia
- Pope Liberius
- Ven. Francis Mary Paul Libermann
- Liber Pontificalis
- Liber Septimus
- Liber Sextus Decretalium
- Libraries
- Ancient Diocese of Lichfield
- St. Lidwina
- Ernst Maria Lieber
- Moriz Lieber
- Bruno Franz Leopold Liebermann
- Diocese of Liège
- Liesborn
- The Master of Liesborn
- Liessies
- Life
- Methodius I
- Ligamen
- Lights
- Ligugé
- Lilienfeld
- Aloisius Lilius
- Lille
- Lillooet Indians
- Archdiocese of Lima
- Limbo
- Pol de Limbourg
- Diocese of Limburg
- Diocese of Limerick
- Diocese of Limoges
- Limyra
- Thomas Linacre
- Archdiocese of Linares
- Diocese of Lincoln
- Diocese of Lincoln (Ancient)
- William Damasus Lindanus
- Justin Timotheus Balthasar, Freiherr von Linde
- Wilhelm Lindemann
- Ancient Diocese and Monastery of Lindisfarne
- Abbey of Lindores
- Anne Line
- John Lingard
- Linoe
- Pope St. Linus
- Diocese of Linz
- Lippe
- Filippino Lippi
- Filippo Lippi
- Luigi Lippomano
- Lipsanotheca
- Justus Lipsius
- Patriarchate of Lisbon
- Diocese of Lismore
- School of Lismore
- Thomas Lister
- Franz Liszt
- Litany
- Litany of Loreto
- Litany of the Holy Name
- Litany of the Saints
- Lithuania
- Litta
- Little Office of Our Lady
- Diocese of Little Rock
- Paul-Maximilien-Emile Littré
- Liturgical Books
- Liturgical Chant
- Liturgy
- Liutprand of Cremona
- Diocese of Liverpool
- Livias
- Llancarvan
- Diocese of Llandaff
- Llanthony Priory
- Ven. John Lloyd
- Garcia de Loaisa
- Vicariate Apostolic of Loango
- Loaves of Proposition
- Benedictine Abbey of Lobbes
- Ann Lobera
- Loccum
- Lochleven
- Stephan Lochner
- Loci Theologici
- Matthew Locke
- William Lockhart
- Ven. John Lockwood
- Diocese of Lodi
- Logia Jesu
- Logic
- The Logos
- Johann Lohel
- Tobias Lohner
- Diocese of Loja
- Lollards
- St. Loman
- Peter Lombard (1)
- Lombardy
- Etienne-Charles de Loménie de Brienne
- London
- Diocese of London (Ontario)
- James Longstreet
- Félix Lope de Vega Carpio
- Francisco Lopez-Caro
- The Lord's Prayer
- Lorea
- Francisco Antonio de Lorenzana
- Pietro and Ambrogio Lorenzetti
- St. Lorenzo da Brindisi
- Lorette
- Sisters of Loretto at the Foot of the Cross
- Claude de Lorrain
- Lorraine
- Lorsch Abbey
- Loryma
- Karl August Lossen
- Lot
- Lottery
- Antonio Lotti
- Lorenzo Lotto
- Loucheux
- St. Louis IX
- Louis XI
- Louis XIV
- Bl. Louis Allemand
- St. Louis Bertrand
- Sister Louise
- Louisiana
- St. Louis-Marie Grignion de Montfort
- Ven. Louis of Casoria
- Louis of Granada
- St. Louis of Toulouse
- Diocese of Louisville
- Brothers of Our Lady of Lourdes
- Notre-Dame de Lourdes
- University of Louvain
- Love (Theological Virtue)
- Low Church
- Low Sunday
- Lübeck
- Diocese of Lublin
- Giovanni Battista de Luca
- Frederick Lucas
- Archdiocese of Lucca
- Diocese of Lucera
- Lucerne
- Lucian of Antioch
- John Lucic
- Lucifer
- Lucifer of Cagliari
- Crypt of Lucina
- Pope St. Lucius I
- Pope Lucius II
- Pope Lucius III
- Diocese of Luçon
- St. Lucy
- St. Ludger
- St. Ludmilla
- Ludolph of Saxony
- Ludovicus a S. Carolo
- Karl Lueger
- Diocese of Lugo
- Francisco de Lugo
| - John de Lugo
- Diocese of Lugos
- Bernardino Luini
- Gospel of Saint Luke
- Lulé Indians
- Jean-Baptiste Lully
- Lumen Christi
- Luminare
- Lummi Indians
- Gottfried Lumper
- Pedro de Luna
- Lund
- Lunette
- Diocese of Luni-Sarzana-Brugnato
- Lupus
- Christian Lupus
- Ottmar Luscinius
- Jean-Baptiste-Alphonse Lusignan
- Melchior Lussy
- Lust
- Martin Luther
- Lutheranism
- Aloys Lütolf
- Diocese of Lutzk, Zhitomir, and Kamenetz
- Luxemburg
- Abbey of Luxeuil
- Lycopolis
- Lydda
- John Lydgate
- Lying
- John Lynch
- William Lyndwood
- Archdiocese of Lyons
- Councils of Lyons
- Lyrba
- Lysias
- Lystra
- Friedrich Bernard Christian Maassen
- Jean Mabillon
- Mabinogion
- Diocese of Macao
- St. Macarius
- Macarius Magnes
- Macarius of Antioch
- Edward McCabe
- Hugh MacCaghwell
- Denis Florence MacCarthy
- Nicholas Tuite MacCarthy
- John McCloskey
- William George McCloskey
- John MacDonald
- Alexander Macdonell
- Mace
- Francisco Macedo
- José Agostinho de Macedo
- United Sees of Macerata and Tolentino
- Francis Patrick McFarland
- Thomas D'Arcy McGee
- James MacGeoghegan
- Machabees
- Books of Machabees
- John MacHale
- Nicolò Machiavelli
- Machpelah
- St. Machutus
- Vicariate Apostolic of Mackenzie
- John McLoughlin
- Marie-Edmé-Patrice-Maurice de MacMahon
- Martin Thomas McMahon
- James Alphonsus McMaster
- William James MacNeven
- Ancient Diocese of Mâcon
- Bernard John McQuaid
- Macri
- Macrina
- James McSherry (1)
- James McSherry (2)
- Richard McSherry
- Mactaris
- Madagascar
- Madaurus, or Madaura
- Carlo Maderna
- Stefano Maderno
- Madianites
- Archdiocese of Madras
- Diocese of Madrid-Alcalá
- Christopher Madruzzi
- Madura Mission
- St. Maedoc
- St. Maelruan
- St. Maelrubha
- Jacob van Maerlant
- Maestro di Camera del Papa
- Bernardino Maffei
- Francesco Maffei
- Raffaelo Maffei
- Antoine-Dominique Magaud
- Magdala
- Magdalens
- Magdeburg
- Mageddo
- Ferdinand Magellan
- Magi
- Magin Catalá
- Simone de Magistris
- Antonio Magliabechi
- Magna Carta
- Magnesia
- Alphonse Magnien
- Magnificat
- St. Magnus
- Olaus Magnus
- Valerianus Magnus
- John Macrory Magrath
- Magydus
- Ven. Charles Mahony
- Angelo Mai
- Emmanuel Maignan
- Joseph-Anna-Marie de Moyria de Mailla
- Antoine-Simon Maillard
- Olivier Maillard
- Louis Maimbourg
- Teaching of Moses Maimonides
- Maina Indians
- Maine
- François-Pierre-Gonthier Maine de Biran
- Françoise, Marquise de Maintenon
- Mainz
- Maipure Indians
- Joseph-Marie, Comte de Maistre
- Xavier de Maistre
- Diocese of Maitland
- Benedetto da Majano
- Diocese of Majorca and Iviza
- Majordomo
- Majority
- Paul Majunke
- Malabar
- Malabar Rites
- Diocese of Malacca
- Malachias
- St. Malachy
- Diocese of Malaga
- Gabriel Malagrida
- House of Malatesta
- Malchus
- Juan Maldonado
- Nicolas Malebranche
- Malediction (in Scripture)
- François Malherbe
- Maliseet Indians
- Ernest-François Mallard
- Hermann von Mallinckrodt
- Pauline Mallinckrodt
- Stephen Russell Mallory
- Mallus
- Malmesbury
- Monk of Malmesbury
- William Malone
- Sir Thomas Malory
- Marcello Malpighi
- Malta
- Claude Maltret
- Thomas Malvenda
- Malvern
- Thomas Maria Mamachi
- Alfred-Henri-Amand Mame
- Mameluco
- Mamertine Prison
- St. Mamertus
- Mammon
- Man
- Manahem
- St. Manahen
- Manasses
- Jeanne Mance
- Diocese of Manchester
- Manchuria
- Mandan Indians
- Jean de Mandeville
- Archdiocese of Manfredonia
- Diocese of Mangalore
- James Clarence Mangan
- Manharter
- Manichæism
- Manifestation of Conscience
| - Archdiocese of Manila
- Manila Observatory
- Maniple
- Manitoba
- Theodore Augustine Mann
- Manna
- Henry Edward Manning
- Robert Mannyng of Brunne
- Mansard
- Gian Domenico Mansi
- Andrea Mantegna
- Mantelletta
- Diocese of Mantua
- Laws of Manu
- Manuel Chysoloras
- Manuscripts
- Illuminated Manuscripts
- Manuscripts of the Bible
- Manuterge
- Aldus Manutius
- Alessandro Manzoni
- Walter Map
- Maphrian
- Prudentius Maran
- Marash
- Carlo Maratta
- Marbodius
- Pierre de Marca
- St. Marcellina
- Pope St. Marcellinus
- Flavius Marcellinus
- Marcellinus Comes
- Marcellinus of Civezza, O.F.M.
- Benedetto Marcello
- Pope St. Marcellus I
- Pope Marcellus II
- Marcellus of Ancyra
- Auzias March
- Jean Baptiste Marchand
- Peter Marchant
- Pompeo Marchesi
- Giuseppe Marchi
- Marcian
- Marciane
- Marcianopolis
- Marcionites
- Marcopolis
- Marcosians
- Joseph Marcoux
- Marcus
- Marcus Diadochus
- Marcus Eremita
- Mardin
- Ambrose Maréchal
- Marenco
- Luca Marenzio
- St. Margaret
- Bl. Margaret Colonna
- Margaret Haughery
- St. Margaret Mary Alacoque
- St. Margaret of Cortona
- Bl. Margaret of Hungary
- Bl. Margaret of Lorraine
- Bl. Margaret of Savoy
- St. Margaret of Scotland
- Margaret of the Blessed Sacrament
- Bl. Margaret Pole
- Margaritae
- Antonio Margil
- Giacomo Margotti
- Maria-Laach
- Xantes Mariales
- Juan Mariana
- Archdiocese of Mariana
- Prefecture Apostolic of Mariana Islands
- Congregation of the Missionaries of Mariannhill
- Marian Priests
- Marianus of Florence
- Marianus Scotus
- Maria Theresa
- Marie Antoinette
- Bl. Marie Christine of Savoy
- Marie de France
- Bl. Marie de l'Incarnation
- Ven. Marie de l'Incarnation
- Marienberg
- Marini
- Luigi Gaetano Marini
- Pope Marinus I
- Pope Marinus II
- Edme Mariotte
- Sts. Maris, Martha, Audifax, and Abachum
- Adam de Marisco
- St. Marius Aventicus
- Lucius Perpetuus Aurelianus Marius Maximus
- Marius Mercator
- St. Mark
- Pope St. Mark
- Gospel of Saint Mark
- Sts. Mark and Marcellian
- Mark of Lisbon
- Paul Maroni
- Maronia
- Maronites
- Vicariate Apostolic of Marquesas Islands
- Diocese of Marquette
- Jacques Marquette
- Marquette League
- Civil Marriage
- History of Marriage
- Mixed Marriage
- Moral and Canonical Aspect of Marriage
- Mystical Marriage
- Ritual of Marriage
- Sacrament of Marriage
- Florence Marryat
- Diocese of Marseilles (Massilia)
- Thomas William Marshall
- Vicariate Apostolic of the Marshall Islands
- Diocese of Marsi
- Diocese of Marsico Nuovo and Potenza
- Luigi Ferdinando, Count de Marsigli
- Marsilius of Padua
- Edmond Martène
- St. Martha
- St. Martial
- John Martiall
- Jean Martianay
- Martianus Capella
- Joseph-Alexandre Martigny
- Pope St. Martin I
- Pope Martin IV
- Pope Martin V
- Martin
- Felix Martin
- Gregory Martin
- Konrad Martin
- Paulin Martin
- St. Martina
- Antonio Martini
- Martino Martini
- Simone Martini
- Diocese of Martinique
- St. Martin of Braga
- St. Martin of Leon
- St. Martin of Tours
- Martin of Troppau
- Martin of Valencia
- John Martinov
- Martinsberg
- George Martinuzzi
- Luis Martin y Garcia
- Martyr
- Peter Martyr d'Anghiera
- Martyrology
- Martyropolis
- Acts of the Martyrs
- Japanese Martyrs
- The Ten Thousand Martyrs
- Martyrs in China
- St. Maruthas
- Mary of Cleophas
- Little Brothers of Mary
- Missionaries of the Company of Mary
- Servants of Mary (Order of Servites)
- Society of Mary (Marist Fathers)
- Society of Mary of Paris
- Name of Mary (1)
- Bl. Mary Anne de Paredes
- Mary de Cervellione
- Ven. Mary de Sales Chappuis
- St. Mary Frances of the Five Wounds of Jesus
- Maryland
- St. Mary Magdalen
- St. Mary Magdalen de' Pazzi
- St. Mary of Egypt
- Mary Queen of Scots
- Mary Tudor
- Masaccio
- Mascoutens Indians
- Masolino da Panicale
- Richard Angelus a S. Francisco Mason
- Masonry (Freemasonry)
- Maspha
- Chapter and Conventual Mass
- Liturgy of the Mass
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