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The Catholic Encyclopedia 1907–1914 · 11,621 articles
- Aachen
- Aaron
- Aaron
- Aaronites
- Abaddon
- Abana
- Abandonment
- Abarim
- Abba
- Abbacy
- Abbacy Nullius of Wettingen-Mehrerau
- Abban
- Abbas Siculus
- Abbate Giuseppe Baini
- Abbé
- Abbess
- Abbey
- Abbey and Congregation of Melk
- Abbey and Diocese of Bobbio
- Abbey and Order of Grandmont
- Abbey and School of Clonmacnoise
- Abbey Nullius of Santa Maria de Monserrato
- Abbey of Abingdon
- Abbey of Ampleforth
- Abbey of Arbroath
- Abbey of Athelney
- Abbey of Barlings
- Abbey of Bec
- Abbey of Benedictbeurn
- Abbey of Bonne-Espérance
- Abbey of Bursfeld
- Abbey of Bury St. Edmund's
- Abbey of Cîteaux
- Abbey of Clairvaux
- Abbey of Cornillon
- Abbey of Corvey
- Abbey of Croyland
- Abbey of Deer
- Abbey of Dissentis
- Abbey of Dorchester
- Abbey of Dundrennan
- Abbey of Dunfermline
- Abbey of Echternach
- Abbey of Einsiedeln
- Abbey of Engelberg
- Abbey of Farfa
- Abbey of Ferrières
- Abbey of Flavigny
- Abbey of Fleury
- Abbey of Floreffe
- Abbey of Fontenelle
- Abbey of Fontfroide
- Abbey of Frigolet
- Abbey of Göttweig
- Abbey of Grottaferrata
- Abbey of Hirschau
- Abbey of Jumièges
- Abbey of Lehnin
- Abbey of Lérins
- Abbey of Lindores
- Abbey of Luxeuil
- Abbey of Mellifont
- Abbey of Melrose
- Abbey of Miridite
- Abbey of Monte Cassino
- Abbey of Morimond
- Abbey of Newhouse
- Abbey of Our Lady of Gethsemani
- Abbey of Pontigny
- Abbey of Prémontré
- Abbey of Rievaulx
- Abbey of Saint Albans
- Abbey of Saint Augustine
- Abbey of Saint Emmeram
- Abbey of Saint Remy
- Abbey of Saint Vaast
- Abbey of Saint-Denis
- Abbey of Sainte-Geneviève
- Abbey of Saint-Ouen
- Abbey of Saints Vincent and Anastasius
- Abbey of Saint-Victor
- Abbey of Savigny
- Abbey of St. Gall
- Abbey of St. Solesmes
- Abbey of Strahov
- Abbey of the Park
- Abbey of Tongerloo
- Abbey of Trinità di Cava dei Tirreni
- Abbey of Vadstena
- Abbey of Villers
- Abbey of Waldsassen
- Abbey of Waverley
- Abbey of Whitby
- Abbey of Wilhering
- Abbo Cernuus
- Abbot
- Abbreviations
- Abbreviators
- Abdenago
- Abdera
- Abdias
- Abdias of Babylon
- Abdication
- Abduction
- Abecedaria
- Abecedarians
- Abel
- Abel
- Abel
- Abenakis
- Aberdeen Breviary
- Abiathar
- Abila
- Abisai
- Abjuration
- Ablegate
- Ablution
- Abner
- Abo
- Abomination of Desolation
- Abortion
- Abraham
- Abraham a Sancta Clara
- Abraham Ecchelensis
- Abraham (in Christian Art)
- Abraham (in Liturgy)
- Abraham Janssens
- Abraham Ortelius
- Abraham Usque
- Abraham van Diepenbeeck
- Abraham Woodhead
- Abraham-ben-Méir Aben-Ezra
- Abrahamites
- Abram J. Ryan
- Abrasax
- Abrogation
- Absalom
- Absalon of Lund
- Absinthe
- Absolute
- Absolution
- Abstemii
- Abstinence
- Abstraction
- Abthain
- Abundius
- Abydus
- Abyss
- Abyssinia
- Acacia
- Acacians
- Acacius, Bishop of Beroea
- Acacius, Bishop of Caesarea
- Acacius, Patriarch of Constantinople
- Acadia
- Acanthus (plant)
- Acanthus (see)
- Acathistus
- Accaron
- Accentus Ecclesiasticus
- Acceptance
- Acceptants
- Accession
- Accessus
- Acciajuoli
- Accident
- Acclamation
- Acclamation (in Papal Elections)
- Accomplice
- Accusations of Treason
- Acephali
- Achab
- Achaia
- Achaicus
- Achard de Saint-Victor
- Achaz
- Achiacharus
- Achille Desurmont
- Achille Gagliardi
- Achimaas
- Achimelech
- Achitopel
- Achor Valley
- Achrida
- Acmonia
- Acoemetae
- Acolouthia
- Acolyte
- Acquaviva
- Acre
- Acrostic
- Act of Settlement (Irish)
- Acta Pilati
- Acta Sanctæ Sedis
- Acta Sanctorum Hiberniæ
- Acta Triadis Thaumaturgæ
- Acts of Roman Congregations
- Acts of the Apostles
- Acts of the Apostles (Biblical Commission)
- Acts of the Martyrs
- Actus et Potentia
- Actus primus
- Actus Purus
- Acuas
- Ad Apostolicae Dignitatis Apicem
- Ad Limina Apostolorum
- Ad Sanctam Beati Petri Sedem
- Ad Universalis Ecclesiae
- Adalbert
- Adalbert I
- Adalbert Stifter
- Adam
- Adam Blackwood
- Adam Contzen
- Adam de Marisco
- Adam Easton
- Adam Franz Lennig
- Adam Heinrich Müller
- Adam in Early Christian Liturgy and Literature
- Adam Krafft
- Adam Mickiewicz
- Adam of Bremen
- Adam of Fulda
- Adam of Murimuth
- Adam of Perseigne
- Adam of Saint Victor
- Adam of Usk
- Adam Scotus
- Adam Tanner
- Adamites
- Adar
- Addas
- Adelaide Anne Procter
- Adelard of Bath
- Adele Amalie Gallitzin
- Adèle Bayer
- Adelmann
- Adelophagi
- Adeodatus
- Adeste Fideles
- Adjuration
- Administrator
- Administrator (of Ecclesiastical Property)
- Admont
- Adolf Pfister
- Adolphe Dechamps
- Adolphe Perraud
- Adolphe-Napoleon Didron
- Adolphus von Dalberg
- Adonai
- Adonias
- Adoption
- Adoptionism
- Adoration
- Adoro Te Devote
- Adrian and Peter von Walenburch
- Adrian Hamsted
- Adrian of Castello
- Adrian Turnebus
- Adrian Willaert
- Adrianople
- Adrien Baillet
- Adrien Greslon
- Adrien Rouquette
- Adso
- Adullam
- Adulteration of Food
- Adultery
- Advent
- Adventists
- Advocates of Roman Congregations
- Advocates of St. Peter
- Advocatus Diaboli
- Advocatus Ecclesiæ
- Advowson
- Adytum
- Aedh of Kildare
- Ægidius of Viterbo
- Aelfric, Abbot of Eynsham
- Ælia Flaccilla
- Ælnoth
- Æneas McDonnell Dawson
- Æneas of Gaza
- Ænon
- Æons
- Aër
- Aërius of Pontus
- Æsthetics
- Æterni Patris (Leo XIII)
- Æterni Patris (Pius IX)
- Aëtius
- Affinity (in Canon Law)
- Affinity (in the Bible)
- Affirmation
- Afflighem
- Afonzo de Albuquerque
- Africa
- African Liturgy
- African Synods
- Agabus
- Agape
- Agapetæ
- Agapetus
- Agathangelus
- Agathias
- Agaunum
- Age of Reason
- Agents of Roman Congregations
- Aggeus (Haggai)
- Agios O Theos
- Agnes Mary Clerke
- Agnetz
- Agnoetae
- Agnolo, Giovanni, and Taddeo Gaddi
- Agnosticism
- Agnus Dei
- Agnus Dei (in Liturgy)
- Agonistici
- Agony of Christ
- Agostini Agazzari
- Agostino Barbosa
- Agostino Bernal
- Agostino Ciasca
- Agostino Steffani
- Agostino Steuco
- Agram
- Agrapha
- Agrarianism
- Agria
- Agrippinus
- Agustín Quintana
- Ahicam
- Ahriman and Ormuzd
- Aisle
- Aistulph
- Akhmin
- Alabama
- Alabanda
- Alabaster
- Alain Chartier
- Alain de l'Isle
- Alain-René Le Sage
- Alalis
- Alan of Tewkesbury
- Alan of Walsingham
- Alanus de Rupe
- Alaska
- Alb
- Alban Butler
- Alban Isidor Stolz
- Albanenses
- Albani
- Albania
- Albano
- Alberic of Monte Cassino
- Alberic of Ostia
- Alberico de Rosate
- Albero de Montreuil
- Albert
- Albert Anton Von Muchar
- Albert Auguste de Lapparent
- Albert II
- Albert (Jean) Belin
- Albert (Joseph) Knoll
- Albert of Aachen
- Albert of Brandenburg
- Albert of Castile
- Albert of Saxony
- Albert of Stade
- Albert (Pigghe) Pighius
- Albert Stöckl
- Albert Vandal
- Albert von Behaim
- Alberto Arnoldi
- Albigenses
- Albinus
- Albornoz, Gil Alvárez Carillo de
- Albrecht Dürer
- Albrecht von Eyb
- Albrecht von Wallenstein
- Albright Brethren
- Alchemy
- Alcimus
- Alcoholism
- Alcuin
- Aldersbach
- Aldfrith
- Aldus Manutius
- Alejandro Herculano de Carvalho e Araujo
- Alessandro Bonvicino
- Alessandro Farnese
- Alessandro Galilei
- Alessandro Manzoni
- Alessandro Piccolomini
- Alessandro Scarlatti
- Alessandro Serpieri
- Alessandro Tassoni
- Alessandro Volta
- Alesso Baldovinetti
- Alexander
- Alexander Agricola
- Alexander Baumgartner
- Alexander Bicknor
- Alexander (Early Bishops)
- Alexander Goss
- Alexander Hegius
- Alexander Hübner
- Alexander Leopold Hohenlohe-Waldenburg-Schillingsfürst
- Alexander Macdonell
- Alexander Martin Sullivan
- Alexander Maximilian Seitz
- Alexander Natalis
- Alexander of Abonoteichos
- Alexander of Hales
- Alexander of Lycopolis
- Alexander of Neckam
- Alexander Pope
- Alexander Severus
- Alexandre de Prouville, Marquis de Tracy
- Alexandre de Rhodes
- Alexandre Guy Pingré
- Alexandre Rodrigues Ferreira
- Alexandre Vincent Jandel
- Alexandre-Antonin Taché
- Alexandre-Etienne Choron
- Alexandria
- Alexandrian Library
- Alexandrine Liturgy
- Alexian Nuns
- Alexians
- Alexis John Augustine Bachelot
- Alexis-François Artaud de Montor
- Alexis-François Rio
- Alexis-Paulin Paris
- Alexis-Xyste Bernard
- Alfonso Capecelatro
- Alfonso de Valdés
- Alfonso de Zamora
- Alfonso Muzzarelli
- Alfonso of Burgos
- Alfred Rethel
- Alfred the Great
- Alfred von Reumont
- Alfred-Henri-Amand Mame
- Alger of Liége
- Algonquins
- Alimentation
- Alimony
- Aliturgical Days
- All Hallows College
- All Saints
- All Souls' Day
- Allah
- Alleluia
- Allocution
- Allori
- Alma
- Alma Redemptoris Mater
- Alms and Almsgiving
- Alogi
- Aloisio Gardellini
- Aloisius Lilius
- Aloisius-Edouard-Camille Gaultier
- Alonso Andrada
- Alonso Berruguete
- Alonso Cano
- Alonso de Ercilla y Zúñiga
- Alonso de Espinosa
- Alonso de Molina
- Alonso de Ojeda
- Alonso Rodriguez
- Alonso Tostado
- Alonzo Coello Sánchez
- Alonzo de Alvarado
- Alonzo de Barcena
- Alonzo Sánchez
- Aloys Karl Ohler
- Aloys Lütolf
- Aloys Senefelder
- Aloysius Bellecius
- Aloysius Gentili
- Aloysius Schlör
- Aloysius Taparelli
- Alpha and Omega (in Jewish Theology)
- Alphabetic Psalms
- Alphons Huber
- Alphonse de Lamartine
- Alphonse Magnien
- Alphonso de Spina
- Alphonsus de Castro
- Alphonsus Salmeron
- Alsace-Lorraine
- Altamura and Acquaviva
- Altar (in Liturgy)
- Altar (in Scripture)
- Altar (in the Greek Church)
- Altar of Repose
- Altruism
- Alumnus
- Alvar Nuñez Cabeza de Vaca
- Alvarez Carillo Gil de Albornoz
- Alvarez de Paz
- Alvaro Alonzo Barba
- Alvaro de Mendaña de Neyra
- Alvarus Pelagius
- Ama
- Amalarius of Metz
- Amalec
- Amalricians
- Amalricus Augerii
- Amasia
- Amastris
- Amathus
- Ambition
- Ambo
- Ambo (in the Russian and Greek Church)
- Ambrogio Borgognone
- Ambrogio Calepino
- Ambrogio Foppa
- Ambroise Paré
- Ambrose Autpert
- Ambrose Bernard O'Higgins
- Ambrose Corbie
- Ambrose Lisle March Phillipps De Lisle
- Ambrose Maréchal
- Ambrose Pelargus
- Ambrose Saint-John
- Ambrosian Basilica
- Ambrosian Chant
- Ambrosian Hymnography
- Ambrosian Library
- Ambrosian Liturgy and Rite
- Ambrosians
- Ambrosiaster
- Ambrosio Morales
- Ambulatory
- Amen
- Amende Honorable
- America
- American College at Louvain
- American College in Rome
- American Federation of Catholic Societies
- American Indians
- American Protective Association
- Amerigo Vespucci
- Amice
- Amiel Weeks Whipple
- Amisus
- Ammon
- Ammonian Sections
- Ammonites
- Amorbach
- Amorios
- Amorrhites
- Amos
- Amovibility
- Amphilochius of Iconium
- Amphilochius of Sida
- Amphoræ
- Ampullæ
- Amra
- Amrah
- Amraphel
- Amsterdam
- Amulet
- Amyclae
- Anabaptists
- Anacletus II
- Anæsthesia
- Analogy
- Analysis
- Anaphora
- Anarchy
- Anastasiopolis
- Anastasius Bibliothecarius
- Anastasius Grün
- Anathema
- Anathoth
- Anatole de Bengy
- Anatole Leroy-Beaulieu
- Anatomy
- Anazarbus
- Anchor
- Anchorites
- Ancient Catholic Diocese of Chichester (Cicestrensis)
- Ancient Catholic Diocese of Durham (Dunelmum)
- Ancient Diocese and Monastery of Lindisfarne
- Ancient Diocese of Bristol
- Ancient Diocese of Canterbury
- Ancient Diocese of Carlisle
- Ancient Diocese of Chester (Cestrensis)
- Ancient Diocese of Ely
- Ancient Diocese of Hereford
- Ancient Diocese of Lichfield
- Ancient Diocese of Mâcon
- Ancient Diocese of Norwich
- Ancient Diocese of Saint Asaph
- Ancient Diocese of Salisbury
- Ancient Diocese of Sodor and Man
- Ancient Diocese of Vaison
- Ancient Diocese of Worcester
- Ancient of Days
- Ancient Order of Hibernians
- Ancient See of Aarhus
- Ancient See of Bergen
- Ancient See of Börglum
- Ancient See of Hamar
- Ancient See of Linköping
- Ancient See of Odense
- Ancient See of Oslo
- Ancient See of Ratzeburg
- Ancient See of Ribe
- Ancient See of Rochester
- Ancient See of Roskilde
- Ancient See of Skara
- Ancient See of Stavanger
- Ancient See of Strengnäs
- Ancient See of Trondhjem
- Ancient See of Upsala
- Ancient See of Vexiö
- Ancient See of Viborg
- Ancient See of Westeraas
- Ancient See of Winchester
- Ancient See of York
- Ancilla Dei
- Ancren Riwle
- Ancyra
- A and Ω
- Andalusia
- Andechs
- André Dacier
- André de Boulanger
- André Garin
- André Guijon
- André Marie Ampère
- André Terrasson
- Andrea Adami da Bolsena
- Andrea Alciati
- Andrea Borromeo
- Andrea Castagno
- Andrea Cesalpino
- Andrea Ciccione
- Andrea Contucci del Sansovino
- Andrea del Sarto
- Andrea del Verrocchio
- Andrea della Robbia
- Andrea Doria
- Andrea Gallandi
- Andrea Mantegna
- Andrea Palladio
- Andrea Pisano
- Andrea Spagni
- Andrea Vanni
- Andreas Agnellus of Ravenna
- Andreas Benedict Feilmoser
- Andreas de Vega
- Andreas Hofer
- Andreas Kobler
- Andreas Medulic
- Andreas of Ratisbon
- Andreas Pozzo
- Andreas Räss
- Andreas Vesalius
- André-Hercule de Fleury
- André-Jean Cuoq
- Andres Cavo
- Andrés Pérez De Ribas
- Andrés Urdaneta
- Andrew Byrne
- Andrew Donlevy
- Andrew Foreman
- Andrew Gordon
- Andrew Krzycki
- Andrew of Caesarea
- Andrew of Lonjumeau
- Andrew of Rhodes
- Andrew of Wyntoun
- Andrew White
- Anemurium
- Ange de Saint Joseph
- Ange de Sainte Rosalie
- Angel
- Angel de Saavedra Remírez de Baquedano
- Angelica Kauffmann
- Angelicals
- Angélique Bullion
- Angelo Clareno da Cingoli
- Angelo Mai
- Angelo Maria Quirini
- Angelo Rocca
- Angelo Secchi
- Angels of the Churches
- Angelus
- Angelus Bell
- Angelus Silesius
- Anger
- Anglican Orders
- Anglicanism
- Anglona-Tursi
- Anglo-Saxon Church
- Angola and Congo
- Anicius Manlius Severinus Boethius
- Anima Christi
- Animals in Christian Art
- Animals in the Bible
- Animism
- Anise
- Ann Lobera
- Anna
- Anna Comnena
- Annals of the Four Masters
- Annas
- Annates
- Anne Catherine Emmerich
- Anne, First Duke of Montmorency
- Anne García
- Anne Hanson Dorsey
- Anne Line
- Anne-Robert-Jacques Turgot
- Anne-Thérèse Guérin
- Annette Elisabeth, Baroness von Hülshoff
- Annibale d'Annibaldi
- Annius of Viterbo
- Annunciation of the Blessed Virgin Mary
- Ansegisus
- Anselm Eckart
- Anselm of Laon
- Anselm of Liège
- Anselmo Banduri
- Antediluvians
- Anthemius
- Anthon Rafael Mengs
- Anthony Blanc
- Anthony Brookby
- Anthony Champney
- Anthony Daniel
- Anthony Koberger
- Anthony Kohlmann
- Anthony Konings
- Anthony Maria Anderledy
- Anthony of Sienna
- Anthony of the Mother of God
- Anthony Parkinson
- Anthony Rey
- Anthony Terill (Bonville)
- Anthropomorphism
- Antichrist
- Antidicomarianites
- Antidoron
- Antimensium
- Antinoe
- Antinomianism
- Antioch
- Antiochene Liturgy
- Antiochus of Palestine
- Antipater of Bostra
- Antipatris
- Antiphellos
- Antiphon
- Antiphon (in Greek Liturgy)
- Antiphon (in the Greek Church)
- Antiphonary
- Antiphonary of Bangor
- Antipodes
- Antipope
- Anti-Pope Felix V (Amadeus of Savoy)
- Antiquity of the World
- Antoine Anselme
- Antoine d'Abbadie
- Antoine de Lamothe, Sieur de Cadillac
- Antoine de Mouchy
- Antoine Duprat
- Antoine Galland
- Antoine Gaubil
- Antoine Godeau
- Antoine Henri de Bérault-Bercastel
- Antoine le Gaudier
- Antoine Massoulié
- Antoine Pagi
- Antoine Perrenot de Granvelle
- Antoine Touron
- Antoine-Augustin Parmentier
- Antoine-Augustin Touttée
- Antoine-César Becquerel
- Antoine-Dominique Magaud
- Antoine-Elisabeth Dareste de la Chavanne
- Antoine-Frédéric Ozanam
- Antoine-Jean-Baptiste-Robert Auget, Baron de Montyon
- Antoine-Joseph Mège
- Antoine-Laurent Lavoisier
- Antoine-Lefebvre, Sieur de la Barre
- Antoine-Léonard de Chézy
- Antoine-Simon Maillard
- Anton Berlage
- Anton Brus
- Anton Dereser
- Anton Günther
- Anton Joseph Binterim
- Anton Martin Slomšek
- Anton Sander
- Anton Ulrich
- Antonello da Messina
- Antonin Reginald
- Antonino Diana
- Antoninus Pius
- Antonio Allegri
- Antonio Amico
- Antonio and Piero Benci Pollajuolo
- Antonio Aparisi y Guijarro
- Antonio Ballerini
- Antonio Bosio
- Antonio Canova
- Antonio Comellas y Cluet
- Antonio da Fonseca Soares
- Antonio de Alcedo
- Antonio de Andrada
- Antonio de Araujo
- Antonio de Herrera y Tordesillas
- Antonio de Molina
- Antonio de Trueba
- Antonio de Ulloa
- Antonio di Matteo di Domenico Rosselino
- Antonio Escobar y Mendoza
- Antonio Espejo
- Antonio Fernández
- Antonio Ferreira
- Antonio Francesco Vezzosi
- Antonio Lotti
- Antonio Magliabechi
- Antonio Margil
- Antonio Martini
- Antonio Montesino
- Antonio Neri
- Antonio Ravalli
- Antonio Ruiz de Montoya
- Antonio Stradivari
- Antonio Tebaldeo
- Antonio Vieira
- Antonis Van Dashorst Mor
- Antonius
- Antonius Augustinus
- Antonius Fischer
- Antonius Possevinus
- Antony Hickey
- Antoon Van Dyck
- Antwerp
- Apaches
- Apameia
- Apelles
- Aphraates
- Apiarius of Sicca
- Apocalypse
- Apocatastasis
- Apocrisiarius
- Apocrypha
- Apodosis
- Apollinarianism
- Apollinaris (The Elder)
- Apollonius of Ephesus
- Apologetics
- Apolysis
- Apolytikion
- Apophthegmata Patrum
- Apostasy
- Apostle (in Liturgy)
- Apostle Spoons
- Apostles
- Apostles' Creed
- Apostleship of Prayer
- Apostolic Blessing
- Apostolic Camera
- Apostolic Canons
- Apostolic Churches
- Apostolic Church-ordinance
- Apostolic College
- Apostolic Constitutions
- Apostolic Examiners
- Apostolic Executor
- Apostolic Expeditors
- Apostolic Fathers
- Apostolic Indulgences
- Apostolic Letters
- Apostolic Majesty
- Apostolic Prefecture of Caquetá
- Apostolic Schools
- Apostolic See
- Apostolic Succession
- Apostolic Syndic
- Apostolic Union of Secular Priests
- Apostolicae Curae
- Apostolicae Sedis Moderationi
- Apostolicæ Servitutis
- Apostolici
- Apostolici Ministerii
- Apostolici Regiminis
- Apostolicity
- Apostolicum Pascendi Munus
- Apotactics
- Apotheosis
- Apparitor
- Appeal as from an abuse
- Appeals
- Appetite
- Approbation
- Appropriation
- Apse
- Apse Chapel
- Apsidiole
- Aquarians
- Aquila and Priscilla
- Aquileia
- Aquileian Rite
- Arabia
- Arabian School of Philosophy
- Arabici
- Arabissus
- Arad
- Arason Jón
- Arator
- Araucanians
- Arawaks
- Arbitration
- Arca
- Arcadiopolis
- Arcae
- Arcanum
- Arch
- Archange de Lyon
- Archbishop
- Archconfraternity
- Archconfraternity of Holy Agony
- Archconfraternity of the Holy Family
- Archconfraternity of the Most Precious Blood
- Archdeacon
- Archdiocese
- Archdiocese of Acerenza
- Archdiocese of Adelaide
- Archdiocese of Agra
- Archdiocese of Aix
- Archdiocese of Albi
- Archdiocese of Aleppo
- Archdiocese of Algiers
- Archdiocese of Amalfi
- Archdiocese of Antivari
- Archdiocese of Aquila
- Archdiocese of Armagh
- Archdiocese of Auch
- Archdiocese of Baltimore
- Archdiocese of Bamberg
- Archdiocese of Bari
- Archdiocese of Belem do Pará
- Archdiocese of Benevento (Beneventana)
- Archdiocese of Besançon (Vesontio)
- Archdiocese of Bologna
- Archdiocese of Bombay
- Archdiocese of Bordeaux (Burdigala)
- Archdiocese of Boston
- Archdiocese of Bourges (Bituricæ)
- Archdiocese of Braga
- Archdiocese of Brisbane
- Archdiocese of Bukarest
- Archdiocese of Burgos
- Archdiocese of Cagliari
- Archdiocese of Calcutta
- Archdiocese of Cambrai
- Archdiocese of Capua
- Archdiocese of Caracas
- Archdiocese of Cartagena
- Archdiocese of Carthage
- Archdiocese of Catania (Catanensis)
- Archdiocese of Chambéry (Camberium)
- Archdiocese of Chicago
- Archdiocese of Chieti
- Archdiocese of Cincinnati
- Archdiocese of Colombo
- Archdiocese of Conza
- Archdiocese of Corfu
- Archdiocese of Cosenza
- Archdiocese of Dublin
- Archdiocese of Dubuque
- Archdiocese of Durango (Durangum)
- Archdiocese of Durazzo
- Archdiocese of Evora
- Archdiocese of Fermo
- Archdiocese of Ferrara
- Archdiocese of Florence
- Archdiocese of Fogaras
- Archdiocese of Gaeta
- Archdiocese of Genoa
- Archdiocese of Glasgow
- Archdiocese of Gnesen-Posen
- Archdiocese of Goa
- Archdiocese of Gran
- Archdiocese of Granada
- Archdiocese of Guadalajara (Guadalaxara)
- Archdiocese of Halifax
- Archdiocese of Hobart
- Archdiocese of Kalocsa-Bacs
- Archdiocese of Kingston
- Archdiocese of La Plata
- Archdiocese of Lanciano and Ortona
- Archdiocese of Lima
- Archdiocese of Linares
- Archdiocese of Lucca
- Archdiocese of Lyons
- Archdiocese of Madras
- Archdiocese of Manfredonia
- Archdiocese of Manila
- Archdiocese of Mariana
- Archdiocese of Mechlin
- Archdiocese of Medellín
- Archdiocese of Melbourne
- Archdiocese of Messina
- Archdiocese of Mexico
- Archdiocese of Michoacan
- Archdiocese of Milan
- Archdiocese of Modena
- Archdiocese of Mohileff
- Archdiocese of Monreale
- Archdiocese of Montevideo
- Archdiocese of Montreal
- Archdiocese of Munich-Freising
- Archdiocese of New Orleans
- Archdiocese of New York
- Archdiocese of Oaxaca
- Archdiocese of Olmütz
- Archdiocese of Oregon City
- Archdiocese of Otranto
- Archdiocese of Ottawa
- Archdiocese of Palermo
- Archdiocese of Perugia
- Archdiocese of Philadelphia
- Archdiocese of Pisa
- Archdiocese of Pondicherry
- Archdiocese of Popayán
- Archdiocese of Port of Spain
- Archdiocese of Port-au-Prince
- Archdiocese of Porto Alegre
- Archdiocese of Prague
- Archdiocese of Quebec
- Archdiocese of Quito
- Archdiocese of Ravenna
- Archdiocese of Reggio di Calabria
- Archdiocese of Reims
- Archdiocese of Rennes
- Archdiocese of Rossano
- Archdiocese of Rouen
- Archdiocese of Saint Andrews and Edinburgh
- Archdiocese of Saint Boniface
- Archdiocese of Saint John's
- Archdiocese of Saint Paul
- Archdiocese of Salzburg
- Archdiocese of San Francisco
- Archdiocese of Santa Fe
- Archdiocese of Santa Fé de Bogotá
- Archdiocese of Santiago de Chile
- Archdiocese of Santiago de Guatemala
- Archdiocese of Santo Domingo
- Archdiocese of São Paulo
- Archdiocese of São Salvador de Bahia de Todos os Santos
- Archdiocese of São Sebastião do Rio de Janeiro
- Archdiocese of Sassari
- Archdiocese of Scopia
- Archdiocese of Scutari
- Archdiocese of Sens
- Archdiocese of Serajevo
- Archdiocese of Seville
- Archdiocese of Siena
- Archdiocese of Simla
- Archdiocese of Sorrento
- Archdiocese of Spoleto
- Archdiocese of Sydney
- Archdiocese of Syracuse
- Archdiocese of Tarragona
- Archdiocese of Toronto
- Archdiocese of Toulouse
- Archdiocese of Tours
- Archdiocese of Tuam
- Archdiocese of Udine
- Archdiocese of Urbino
- Archdiocese of Utrecht
- Archdiocese of Valencia
- Archdiocese of Valladolid
- Archdiocese of Vancouver
- Archdiocese of Verapoly
- Archdiocese of Vercelli
- Archdiocese of Warsaw
- Archdiocese of Wellington
- Archdiocese of Westminster
- Archdiocese of Yucatán
- Archdiocese of Zara
- Archelais
- Archiereus
- Archimandrite
- Archontics
- Archpriest
- Archpriest Controversy
- Arcosolium
- Arculf
- Ardbraccan
- Ardo Smaragdus
- Areopagus
- Areopolis
- Arethas of Caesarea
- Arethusa
- Argentine Republic
- Argos
- Arianism
- Ariassus
- Aribo
- Arindela
- Aristaces Azaria
- Aristeas
- Aristides
- Aristotle
- Arius
- Arizona
- Arizona (supplement)
- Ark
- Arkansas
- Armand David
- Armand de La Richardie
- Armand-Benjamin Caillau
- Armand-Hippolyte-Louis Fizeau
- Armand-Jean du Plessis, Duke de Richelieu
- Armella Nicolas
- Armenia
- Armenian Catholic Diocese of Sebastia
- Armenierstadt
- Arminianism
- Arnaldus Villanovanus
- Arnaud d'Ossat
- Arnauld
- Arni Thorlaksson
- Arnobius
- Arnold
- Arnold Förster
- Arnold Ipolyi
- Arnold Janssen
- Arnold of Brescia
- Arnold Pannartz and Konrad Sweinheim
- Arnolfo di Cambio
- Arnulf of Bavaria
- Arnulf of Lisieux
- Arsacidæ
- Arsenius Autorianos
- Arsinoe
- Artemon
- Arthur Moore
- Arthur O'Leary
- Arthur-Marie Le Hir
- Arthur-Richard Dillon
- Articles of Faith
- Artoklasia
- Artvin
- Ascalon
- Ascelin
- Ascendente Domino
- Ascension
- Ascetical Theology
- Asceticism
- Aseity
- Aseneth
- Aser
- Asgaard
- Ash Wednesday
- Ashes
- Asia
- Asia Minor
- Asiongaber
- Asmodeus
- Aspendus
- Asperges
- The Ass (in Caricature of Christian Beliefs and Practices)
- Assemani
- Assemblies of the French Clergy
- Assessor of the Holy Office
- Assessors
- Assideans
- Assistant at the Pontifical Throne
- Assistant Priest
- Assize of Clarendon
- Assizes of Jerusalem
- Association of Ideas
- Association of Priestly Perseverance
- Association of the Holy Childhood
- Assuerus
- Assumption
- Assur
- Assur
- Assyria
- Asterisk
- Asterius
- Aston
- Astrology
- Astronomy
- Astronomy in the Bible
- Asylums and Care for the Insane
- Atahuallpa
- Atavism
- Athanasian Creed
- Athanasius Kircher
- Atheism
- Athenagoras
- Athenry
- Atom
- Atomism
- Atrib
- Atrium
- Attainder
- Attalia
- Atticus
- Attila
- Atto
- Atto of Pistoia
- Atto of Vercelli
- Attrition
- Attuda
- Aubert Miraeus
- Aubrey Beardsley
- Aubrey Thomas Hunt de Vere
- Auctorem Fidei
- Auditor
- Audran
- Augilæ
- August Allerstein
- August Friedrich Gfrörer
- August Reichensberger
- August Roskoványi
- August Wilhelm Ambros
- Augusta
- Augusta Theodosia Drane
- Auguste Carayon
- Auguste Nélaton
- Auguste Nicolas
- Auguste-François Maunoury
- Auguste-Joseph-Alphonse Gratry
- Auguste-Théodore-Paul de Broglie
- Augustin Barruel
- Augustin Bonnetty
- Augustin de Backer
- Augustin Magloire Blanchet
- Augustín Moreto y Cabaña
- Augustin Theiner
- Augustin Verot
- Augustin von Alfeld
- Augustine Francis Hewit
- Augustine Reding
- Augustine Van De Vyver
- Augustinians of the Assumption
- Augustin-Jean Fresnel
- Augustin-Louis Cauchy
- Augustino Oldoini
- Augustinus-Verein
- Augustopolis
- Augustus
- Augustus Thébaud
- Augustus Welby Northmore Pugin
- Aulne Abbey
- Aumbry
- Aurea
- Aurelian
- Aureliopolis
- Aurelius
- Aurelius Clemens Prudentius
- Auriesville
- Aurora Lucis Rutilat
- Ausculta Fili
- Ausonio Franchi
- Australia
- Austro-Hungarian Monarchy
- Authentic
- Authenticity of the Bible
- Authorized Version
- Autocephali
- Autos Sacramentales
- Auxentius
- Auxiliary Bishop
- Auxilius of Naples
- Auzias March
- Ava
- Avarice
- Avatār
- Ave Maris Stella
- Ave Regina
- Avempace
- Averbode
- Averroes
- Avesta
- Avicebron
- Avicenna
- Avignon
- Axum
- Aymará
- Aymeric of Piacenza
- Azores
- Azotus
- Aztecs
- Azymes
- Azymites
The Catholic Encyclopedia, Charles G. Herbermann et al., eds. (New York: Robert Appleton Company, 1907–1914). Public domain. Text as transcribed by Wikisource.