Catholic Encyclopedia (1913)/Volume 1
From Wikisource
| ←Tables of Abbreviations | Catholic Encyclopedia (1913) Volume 1 |
Volume 2→ |
- Aachen
- Aaron
- Abaddon
- Abandonment
- Pedro Abarca
- Abarim
- Abba
- St. Abban of Magheranoidhe
- St. Abban of New Ross
- St. Abban the Hermit
- Abbé
- Jean Baptiste Abbeloos
- Abbess
- Abbey
- Abbo Cernuus
- St. Abbon
- Commendatory Abbot
- Henry Abbot
- Abbot
- Lay Abbot
- Methods of Abbreviation
- Ecclesiastical Abbreviations
- Abbreviators
- Abdera
- Abdias
- Abdias of Babylon
- Abdication
- Sts. Abdon and Sennen
- Abduction
- Abecedaria
- Abecedarians
- Abel
- Abel
- Peter Abelard
- Bl. Thomas Abel (vol. xiv)
- Louis Abelly
- Abenakis
- Abraham-ben-Méir Aben-Ezra
- Inscription of Abercius
- John Abercromby
- Robert Abercromby
- The Diocese of Aberdeen
- The University of Aberdeen
- Moritz von Aberle
- The Legend of Abgar
- Abiathar
- Abila
- The Abbey of Abingdon
- Thomas Abington
- Biogenesis and Abiogenesis
- Abipones
- Abisai
- Abjuration
- Abner
- The Abomination of Desolation
- Abortion
- The Physical Effects of Abortion
- Don Isaac Abrabanel
- Abraham a Sancta Clara
- The Bosom of Abraham
- Abraham Ecchelensis
- Abraham
- Abraham (in Liturgy)
- Abrahamites
- Nicholas Abram
- Abrasax
- Absalom
- Absalon of Lund
- Absinthe
- The Absolute
- Absolution
- Abstemii
- Abstinence
- Physical Effects of Abstinence
- Abstraction
- Abthain
- Theodore Abucara
- Abundius
- Abydus
- Abyss
- Abyssinia
- Acacia
- The Acacians
- Acacius
- Acacius
- Acacius
- St. Acacius
- Roman Academies
- The French Academy
- Acadia
- Acanthus (plant)
- Acanthus (see)
- Acathistus
- Accaron
- St. Acca
- Accentus Ecclesiasticus
- Acceptance
- Acceptants
- Accession
- Accessus
- Acciajuoli
- Accident
- Acclamation
- Acclamation (in Papal Elections)
- Biblical Accommodation
- Accomplice
- Francesco Accursius
- Acephali
- The Archdiocese of Acerenza
- Achab
- Achaia
- Achaicus
- Achaz
- Achiacharus
- Sts. Nereus and Achilleus, Domitilla and Pancratius
- Achimaas
- Achimelech
- Achitopel
- The Diocese of Achonry
- Achor Valley
- Achrida
- Johann Heinrich Achterfeldt
- Theodore William Achtermann
- Valens Acidalius
- The Diocese of Aci-Reale
- Leopold Ackermann
- Acmonia
- Acoemetae
- Acolouthia
- Acolyte
- Joaquín Acosta
- José de Acosta
- Acquapendente
- Claudius Acquaviva
- Acquaviva
- Acqui
- Acre
- Acrostic
- Acta Pilati
- Acta Sanctæ Sedis
- Acta Sanctorum Hiberniae
- Acta Triadis Thaumaturgæ
- Act of Settlement (Irish)
- Charles Januarius Acton
- John Emerich Edward Dalberg Acton, Baron Acton
- John Francis Edward Acton
- John Acton
- Canonical Acts
- Human Acts
- Indifferent Acts
- Acts of Roman Congregations
- Acts of the Apostles
- Acts of the Martyrs
- Actual Grace
- Actus et Potentia
- Actus primus
- Actus Purus
- Acuas
- St. Adalard
- Adalbert
- Adalbert I
- St. Adalbert (of Bohemia)
- St. Adalbert (of Germany)
- The Books of Adam
- Adam
- Andrea Adami da Bolsena
- Adam in Early Christian Liturgy and Literature
- Adamites
- John Adam
- St. Adamnan
- Nicholas Adam
- Adam of Bremen
- Adam of Fulda
- Adam of Murimuth
- Adam of Perseigne
- Adam of St. Victor
- Adam of Usk
- Adam Scotus
- James Adams
- Ven. John Adams
- Adana
- Ad Apostolicae Dignitatis Apicem
- Adar
- Sts. Felix and Adauctus
- Doctrine of Addai
- Addas
- Liturgy of Addeus and Maris
- Ecclesiastical Addresses
- The Archdiocese of Adelaide
- St. Adelaide (of Burgundy)
- St. Adelaide (of Cologne)
- Adelard of Bath
- John Placid Adelham
- Adelmann
- Adelophagi
- Vicariate Apostolic of Aden
- Adeodatus
- Pope St. Deusdedit
- Pope St. Adeodatus
- Adeste Fideles
- Adjuration
- Ad Limina Apostolorum
- Visit ad Limina
- Administrator
- Administrator (of Ecclesiastical Property)
- Canonical Admonitions
- Admont
- Adonai
- Adonias
- St. Ado of Vienne
- Canonical Adoption
- Adoption
- Adoptionism
- Supernatural Adoption
- Adoration
- Perpetual Adoration
- Francis Adorno
- Adoro Te Devote
- Adria
- Pope Adrian I
- Pope Adrian II
- Pope St. Adrian III
- Pope Adrian IV
- Pope Adrian V
- Pope Adrian VI
- Bl. Adrian Fortescue
- St. Adrian of Canterbury
- Adrian of Castello
- Adrianople
- Christian Kruik van Adrichem
- Ad Sanctam Beati Petri Sedem
- Adso
- Diego Francisco Aduarte
- Adullam
- Adulteration of Food
- Adultery
- Ad Universalis Ecclesiae
- Advent
- Adventists
- Book of Advertisements
- Advocates of Roman Congregations
- Advocates of St. Peter
- Advocatus Diaboli
- Advocatus Ecclesiæ
- Advowson
- Adytum
- St. Aedan of Ferns
- Aedh of Kildare
- Bl. Aegidius of Assisi
- Ægidius of Viterbo
- Aelfric, Abbot of Eynsham
- Ælnoth
- St. Ælred
- Æneas of Gaza
- St. Aengus (the Culdee)
- Ænon
- Æons
- Aër
- Aëris of Pontus
- Æsthetics
- Æterni Patris (Leo XIII)
- Æterni Patris (Pius IX)
- Aëtius
- Affinity (in Canon Law)
- Affinity (in the Bible)
- Affirmation
- Afflighem
- Denis Auguste Affre
- St. Afra
- Africa
- Early African Church
- African Liturgy
- African Synods
- Agabus
- Agape
- Agapetae
- Pope St. Agapetus I
- Pope Agapetus II
- Agapetus
- William Seth Agar
- Agathangelus
- St. Agatha
- Agathias
- Pope St. Agatho
- Agaunum
- Agostini Agazzari
- Council of Agde
- Canonical Age
- The Diocese of Agen
- Agents of Roman Congregations
- Age of Reason
- Aggeus (Haggai)
- Unjust Aggressor
- St. Agilulfus
- Agios O Theos
- Fra. Guglielmo Agnelli
- Giuseppe Agnelli
- Bl. Agnellus of Pisa
- Andreas Agnellus of Ravenna
- Maria Gaetana Agnesi
- St. Agnes of Assisi
- St. Agnes of Bohemia
- St. Agnes of Montepulciano
- St. Agnes of Rome
- Agnetz
- Agnoetae
- Agnosticism
- Agnus Dei
- Agnus Dei (in Liturgy)
- Agonistici
- Agony of Christ
- Paolo Agostini
- Bl. Agostino Novello
- Agra
- Agram
- Agrapha
- Agrarianism
- Maria de Agreda
- Agria
- St. Agricius
- Alexander Agricola
- George Agricola
- Rudolph Agricola
- Heinrich Cornelius Agrippa of Nettesheim
- Agrippinus
- Aguas Calientes
- Joseph Saenz de Aguirre
- Ahicam
- Ahriman and Ormuzd
- Johann Caspar Aiblinger
- Gregor Aichinger
- St. Aidan of Lindisfarne
- Duchess of Aiguillon
- Mary Aikenhead
- St. Ailbe
- St. Aileran
- Mateo Aimerich
- Diocese of Aire
- Giacomo Maria Airoli
- Aisle
- Aistulph
- Archdiocese of Aix
- Councils of Aix-en-Provence
- Diocese of Ajaccio
- Akhmin
- Michael & Nicetas Akominatos
- Alabama
- Alabanda
- Alabaster
- The Diocese of Alagoas
- Pietro Alagona
- Alain de l'Isle
- Alalis
- Lucas Alaman
- Niccolò Alamanni
- Alan of Tewkesbury
- Alan of Walsingham
- Alanus de Rupe
- Pedro Antonio de Alarcón
- Alaska
- Alatri
- Albanenses
- Albania
- Albani
- Albano
- St. Alban
- Albany
- Diocese of Alba Pompeia
- Albenga
- Niccolo Albergati
- Alberic of Monte Cassino
- Alberic of Ostia
- Albero de Montreuil
- Giulio Alberoni
- Saskatchewan and Alberta
- Bl. Albert Berdini of Sarteano
- Blessed Albert
- Albert
- Albert II
- Leandro Alberti
- Leone Battista Alberti
- Nicolò Albertini
- Albert of Aachen
- Albert of Brandenburg
- Albert of Castile
- Albert of Saxony
- Albert of Stade
- John Baptist Albertrandi
- St. Albert
- St. Albertus Magnus
- Alb
- Archdiocese of Albi (Albia)
- Council of Albi
- Sigismund Albicus
- Albigenses
- Juan de Albi
- Albinus
- Johann G. Albrechtsberger
- The Albright Brethren
- Afonzo de Albuquerque
- University of Alcalá
- Military Order of Alcántara
- Antonio de Alcedo
- Alchemy
- Andrea Alciati
- Alcimus
- St. Alcmund
- John Alcock
- Alcoholism
- Alcuin
- St. Aldegundis
- Aldersbach
- Aldfrith
- St. Aldhelm
- St. Aldric
- Ulissi Aldrovandi
- Leonard Alea
- Phillipe Alegambe
- Francisco Xavier Alegre
- Joseph Sadoc Alemany
- Giulio Alenio
- Aleppo
- Ales and Terralba
- Alessandria della Paglia
- Galeazzo Alessi
- Alessio
- Pope St. Alexander I
- Pope Alexander II
- Pope Alexander III
- Pope Alexander IV
- Alexander V
- Pope Alexander VI
- Pope Alexander VII
- Pope Alexander VIII
- Blessed Alexander Briant
- The Church of Alexandria
- Alexander (Early Bishops)
- Alexander, name of seven men
- Alexander Natalis
- Alexander of Abonoteichos
- Alexander of Hales
- Alexander of Lycopolis
- St. Alexander
- St. Alexander (II)
- St. Alexander (of Alexandria)
- Bl. Alexander Sauli
- Dom Jacques Alexandre
- Councils of Alexandria
- The Diocese of Alexandria
- Alexandria
- The Alexandrian Library
- The Alexandrine Liturgy
- Codex Alexandrinus
- Alexian Nuns
- Alexians
- St. Alexis Falconieri
- St. Alexius
- Ven. Thomas Alfield
- Count Vittorio Alfieri
- Pietro Alfieri
- Alfonso de Zamora
- Alfonso of Burgos
- Michael Alford
- Alfred the Great
- St. Alfrida
- St. Alfwold
- Alger of Liége
- Alghero
- Algiers
- Algonquins
- Alife
- Dante Alighieri
- Alimentation
- Alimony
- Aliturgical Days
- Allahabad
- Allah
- Paul Allard
- Leo Allatius
- Joseph Allegranza
- Antonio Allegri
- Gregorio Allegri
- Alleluia
- Jean Allemand
- Edward Patrick Allen
- Frances Allen
- George Allen
- John Allen (II)
- John Allen
- William Allen
- August Allerstein
- All Hallows College
- Holy Alliance
- Thomas William Allies
- Joseph Franz Allioli
- William Allison
- Allocution
- Allori
- William Allot
- Claude Allouez
- All Saints' Day
- All Souls' Day
- Diego de Almagro
- Alma
- Alma Redemptoris Mater
- John Almeida
- Almeria
- Camillo Almici
- John Almond
- Oliver Almond
- Ven. John Almond
- Alms and Almsgiving
- St. Alnoth
- Alogi
- St. Aloysius Gonzaga
- Alpha and Omega
- Alpha and Omega (in Scripture)
- Christian Use of the Alphabet
- St. Elphege
- St. Alphonsus Liguori
- St. Alphonsus Rodriguez
- Prospero Alpini
- Alsace-Lorraine
- Diego Francisco Altamirano
- Altamura and Acquaviva
- Altarage
- Altar Bell
- Altar Breadboxes
- Altar Breads
- Altar Candles
- Altar Candlesticks
- Altar Canopy
- Altar Cards
- Altar Carpets
- Altar Cavity
- Altar Cloths
- Altar Crucifix
- Altar Curtain
- Double Altar
- Altar Frontal
- High Altar
- History of the Christian Altar
- Altar Horns
- Altar (in Liturgy)
- Altar Lamp
- Altar Lanterns
- Altar Ledge
- Altar Linens
- Altar of Our Lady
- Altar of Repose
- Altarpiece
- Portable Altar
- Privileged Altar
- Altar Protector
- Altar Rail
- Altar Screen
- Altar Side
- Altars (in the Greek Churches)
- Altars (in Scripture)
- Altar Steps
- Altar Stole
- Altar Stone
- Stripping of an Altar
- Altar Tomb
- Altar Vase
- Altar Vessels
- Altar Wine
- Blessed Altmann
- Alton
- Diocese of Altoona
- St. Alto
- Altruism
- Illuminati
- Alumnus
- Niccolò Alunno
- The Duke of Alva
- Alonzo de Alvarado
- Fray Francisco de Alvarado
- Pedro de Alvarado
- Balthazar Alvarez
- Alvarez de Paz
- Diego Alvarez
- Manoel Alvarez
- Alvarus Pelagius
- St. Alypius
- José Antonio Alzate
- Johann Baptist Alzog
- Giovanni Antonio Amadeo
- Amadia and Akra
- Ama
- Amalarius of Metz
- St. Amalberga
- St. Amalberga
- Amalec
- Amalfi
- Amalricians
- Amalricus Augerii
- St. Amandus
- Amasia
- Amastris
- Amathus
- Thaddeus Amat
- Diocese of Amazones
- Peter Ambarach
- Ambition
- Ambo
- Ambo (in the Russian and Greek Church)
- Our Lady of Ambronay
- August Wilhelm Ambros
- St. Ambrose of Camaldoli
- Bl. Ambrose of Sienna
- St. Ambrose
- Ambrosian Basilica
- Ambrosian Chant
- Ambrosian Hymnography
- The Ambrosian Library
- Ambrosian Liturgy and Rite
- Ambrosians
- Ambrosiaster
- Ambulatory
- Amelia
- Denis Amelote
- Amende Honorable
- Amen
- Veit Amerbach
- America
- The American College at Louvain
- The American College in Rome
- The South American College in Rome
- The American Protective Association
- Pre-Columbian Discovery of America
- Amerigo Vespucci
- Francis Kerril Amherst, D.D.
- Ven. John Amias
- Codex Amiatinus
- Amice
- Antonio Amico
- Francesco Amico
- The Diocese of Amida
- Diocese of Amiens
- Joseph Maria Amiot
- Amisus
- Daniel Ammen
- Ammon
- Ammonian Sections
- Ammonites
- St. Ammon
- Amorbach
- Amorios
- Amorrhites
- Eusebius Amort
- Amos
- Amovibility
- The Vicariate Apostolic of Amoy
- André Marie Ampère
- Amphilochius of Iconium
- Amphilochius of Sida
- Amphoræ
- The Abbey of Ampleforth
- Ampullæ
- Diocese of Ampurias
- Amrah
- Amra
- Amraphel
- Amsterdam
- Amulet
- Use and Abuse of Amulets
- Amyclae
- Jacques Amyot
- Anabaptists
- Pope St. Anacletus
- Anacletus II
- Anæsthesia
- Anagni
- Analogy
- Analysis
- Anaphora
- Anarchy
- St. Anastasia
- Anastasiopolis
- Pope St. Anastasius I
- Pope Anastasius II
- Pope Anastasius III
- Pope Anastasius IV
- Anastasius Bibliothecarius
- St. Anastasius
- St. Anastasius
- St. Anastasius Sinaita
- Anathema
- Anathoth
- St. Anatolia
- St. Anatolius
- St. Anatolius
- Anatomy
- Anazarbus
- Pedro de Añazco
- Joseph Anchieta
- The Anchor (as Symbol)
- Anchorites
- Ancient of Days
- Ancient Order of Hibernians
- Ancilla Dei
- Ancona and Umana
- Ancren Riwle
- Councils of Ancyra
- Ancyra
- Andalusia
- Andechs
- William Henry Anderdon
- Anthony Maria Anderledy
- Henry James Anderson
- Lionel Albert Anderson
- Patrick Anderson
- James Anderton
- Roger Anderton
- Thomas Anderton
- Ven. Robert Anderton
- Heinrich Bernhard, Freiherr von Andlaw
- Ven. William Andleby
- Alonso Andrada
- Antonio de Andrada
- Diego Andrada de Payva
- Blessed Andrea Dotti
- Andrea Pisano
- Andreas of Ratisbon
- Bernard André
- Felix de Andreis
- Juan Andrés
- Juan Andres
- St. Andrew Avellino
- St. Andrew Bobola
- St. Andrew Corsini
- Andrew of Caesarea
- St. Andrew of Crete
- Andrew of Lonjumeau
- Andrew of Rhodes
- St. Andrew
- St. Andrew
- William Eusebius Andrews
- St. Andrew the Scot
- Yves Marie André
- Diocese of Andria
- Sts. Tarachus, Probus, and Andronicus
- Anemurium
- Felice Anerio
- Giovanni Francesco Anerio
- Filippo Anfossi
- Ange de Sainte Rosalie
- Ange de Saint Joseph
- St. Angela Merici
- Bl. Angela of Foligno
- Guardian Angel
- Hail Mary
- The Angelicals
- Fra Angelico
- Francesco Degli Angeli
- Girolamo degli Angeli
- Bl. Angelo Carletti di Chivasso
- Angelo Clareno da Cingoli
- Early Christian Representations of Angels
- Angels
- Angels of the Churches
- Angelus Bell
- Angelus
- Silesius Angelus
- Anger
- Angers
- University of Angers
- Notre Dame de Anges
- St. Angilbert
- Francesco Angiolini
- The Priory of Anglesea
- Anglicanism
- Anglican Orders
- Timothy Warren Anglin
- Anglona-Tursi
- The Anglo-Saxon Church
- Angola and Congo
- Angora
- Angoulême
- Angra
- Pedro Angulo
- Anhalt
- Pope St. Anicetus
- Anima Christi
- College and Church of the Anima (in Rome)
- Cruelty to Animals
- Animals in Christian Art
- Animals in the Bible
- Animism
- Giovanni Animuccia
- Anise
- Anna Comnena
- Anna
- Ecclesiastical Annals
- Annas
- Annates
- François Annat
- Annecy
- Sainte Anne d'Auray
- Sainte Anne de Beaupré
- Ven. Anne de Xainctonge
- Joseph Annegarn
- St. Anne Line
- Venerable Anne-Marie Javouhey
- St. Anne
- Annius of Viterbo
- St. Anno
- The Feast of the Annunciation
- The Annunciation
- The Orders of the Annunciation
- Louis-Pierre Anquetil
- Casto Innocenzio Ansaldi
- Giordano Ansaloni
- St. Anschar
- Councils of Anse
- Ansegisus
- St. Ansegisus
- Antoine Anselme
- Anselm of Laon
- Anselm of Liège
- St. Anselm of Lucca, the Younger
- St. Anselm
- St. Anselm
- Reyer Anslo
- Thomas Chisholm Anstey
- Antediluvians
- Pope St. Anterus
- Joseph Anthelmi
- Anthemius
- Anthony of the Mother of God
- St. Anthony of Padua
- Anthony of Sienna
- Orders of St. Anthony
- St. Anthony
- Anthropomorphism, Anthropomorphites
- Antichrist
- Antidicomarianites
- Antidoron
- Antigonish
- Antimensium
- Antinoe
- Antinomianism
- The Church of Antioch
- Antiochene Liturgy
- Antioch
- Antiochus of Palestine
- Antipater of Bostra
- Antipatris
- Antiphellos
- Gregorian Antiphonary
- Antiphonary
- Communion Antiphon
- Antiphon
- Antiphon (in the Greek Church)
- Antiphon (in Greek Liturgy)
- Antipodes
- Antipope
- Biblical Antiquities
- Antivari
- Antofogaste
- Paul Gabriel Antoine
- Giacomo Antonelli
- Leonardo Antonelli
- Nicolò Maria Antonelli
- Giovanni Antoniano
- Silvio Antoniano
- Charles Antoniewicz
- Antoninus Pius
- St. Antoninus
- Antonio Aparisi y Guijarro
- St. Antonio Maria Zaccaria
- Maria Antonio of Vicenza
- Antonius
- Anton Ulrich
- Franz Joseph Antony
- Antwerp
- Fray Domingo de la Anunciación
- Fray Juan de la Anunciación
- Aosta
- Apaches
- Apameia
- Apelles
- St. Aphian
- Aphraates
- Apiarius of Sicca
- Apocalypse
- Apocatastasis
- Apocrisiarius
- Apocrypha
- Apodosis
- Apollinarianism
- St. Apollinaris Claudius
- Apollinaris (the Elder)
- St. Apollinaris
- St. Apollinaris
- St. Apollonia
- Apollonius of Ephesus
- Apologetics
- Apolysis
- Apolytikion
- Apophthegmata Patrum
- Ferrante Aporti
- Apostasy
- Apostle (in Liturgy)
- Apostles' Creed
- The Apostleship of Prayer
- Apostles
- The Twelve Apostles of Erin
- Apostle Spoons
- Portraits of the Apostles
- Apostolicae Curae
- Apostolicae Sedis Moderationi
- Apostolicæ Servitutis
- Apostolic Blessing
- Apostolic Camera
- Apostolic Churches
- Apostolic Church-Ordinance
- Apostolic College
- Apostolic Constitutions
- Apostolic Executor
- Apostolic Expeditors
- The Apostolic Fathers
- Apostolici
- Apostolici Ministerii
- Apostolici Regiminis
- Apostolicity
- Apostolic Letters
- Apostolic Majesty
- The Apostolic See
- Apostolic Succession
- Apostolicum Pascendi Minis
- The Apostolic Union of Secular Priests
- Apotactics
- Apotheosis
- Visions and Apparitions
- Apparitor
- Appeal as from an abuse
- Appeals
- Appetite
- Approbation
- Appropriation
- Apse Chapel
- Apse
- Apsidiole
- Council of Apt
- Aquarians
- Aquila and Priscilla
- The Archdiocese of Aquila
- Councils of Aquileia
- Aquileia
- Aquileian Rite
- St. Thomas Aquinas
- Aquino, Sora, and Pontecorvo
- Councils of Arabia
- Arabia
- Arabian School of Philosophy
- The Vicariate Apostolic of Arabia
- Arabici
- Arabissus
- Arad
- Castile and Aragon
- Council of Aranda
- Philip Aranda
- The Monastic School of Aran
- Arason Jón
- Arator
- Araucanians
- Prefecture Apostolic of Araucania
- Antonio de Araujo
- Francisco de Araujo
- Arawaks
- Ignacio de Arbieto
- Arbitration
- St. Arbogast
- Abbey of Arbroath
- Missal of Arbuthnott
- Our Lady of Arcachon
- Jacob Arcadelt
- Arcadiopolis
- Arcae
- Arca
- Arcanum
- Christian Archaeology
- The Commission of Sacred Archæology
- Archange de Lyon
- Archbishop
- Archconfraternity
- Archconfraternity of Holy Agony
- Archdeacon
- Richard Archdeacon
- Archdiocese
- Archelais
- James Archer
- The Court of Arches
- Arch
- Archiereus
- Archimandrite
- Filipo Archinto
- Ecclesiastical Architecture
- Gothic Architecture
- Ecclesiastical Archives
- Archontics
- Archpriest Controversy
- Archpriest
- Arcosolium
- Arculf
- Ardagh
- Ardbraccan
- The Priory of Ardchattan
- Edward Arden
- Notre Dame des Ardilliers
- Areopolis
- The Diocese of Arequipa
- Arethas of Caesarea
- Arethusa
- Faustino Arévalo
- Rodríguez Sanchez de Arévalo
- Arezzo
- Argentina
- Argos
- Luis Antonio Argüello
- Diocese of Argyll and the Isles
- John Argyropulos
- St. Arialdo
- Arianism
- Ariano
- Pedro Arias de Avila
- Francis Arias
- Benedictus Arias Montanus
- Ariassus
- Aribo
- Arindela
- Ludovico Ariosto
- Aristeas
- Aristides
- Aristotle
- Arius
- Arizona
- Arkansas
- Noah's Ark
- Ark of the Covenant
- Fray José Arlegui
- The Synods of Arles
- The Spanish Armada
- The Book of Armagh
- Armagh
- The School of Armagh
- Mariano Armellino
- Armenia
- Armenierstadt
- Fray Nicolás Armentia
- Armidale
- Arminianism
- Arnauld
- Thomas Augustine Arne
- Arni Thorlaksson
- Arnobius
- Arnold
- Alberto Arnoldi
- Bartholomaeus Arnoldi
- Arnold of Brescia
- Arnolfo di Cambio
- Peter Joseph Arnoudt
- Veit Arnpeck
- Arnulf of Bavaria
- Arnulf of Lisieux
- St. Arnulf of Metz
- Councils of Arras
- Arras
- Pablo José Arriaga, S.J.
- Juan Arricivita
- Nicola Arrighetti
- Nicolò Arrighetti
- Ven. Edmund Arrowsmith
- Arsacidæ
- Arsenius Autorianos
- St. Arsenius
- Arsinoe
- Christian Art
- Ecclesiastical Art
- Artemon
- James Arthur
- Thomas Arthur
- Articles of Faith
- The Organic Articles
- Artoklasia
- Bachelor of Arts
- The Faculty of Arts
- Master of Arts
- The Seven Liberal Arts
- Artvin
- Arundell
- Thomas Arundel
- St. Asaph
- Ascalon
- Ascelin
- Ascendente Domino
- Feast of the Ascension
- Ascension
- Ascetical Theology
- Asceticism
- Joseph, Ritter von Aschbach
- Ascoli-Piceno
- Ascoli, Satriano, and Cirignola
- Aseity
- Aseneth
- Aser
- Asgaard
- George Ashby
- Thomas Ashby
- Ashes
- Ash Wednesday
- Ven. Ralph Ashley
- John Ashton
- Ven. Roger Ashton
- Asia
- Asia Minor
- Asiongaber
- Robert Aske
- Asmodeus
- Aspendus
- Asperges
- Martin Aspilcueta
- Assam
- Assemani
- Assemblies of the French Clergy
- John Asser
- Feast of Asses
- Assessor of the Holy Office
- Assessors
- St. Assicus
- Assideans
- Physiological Assimilation
- Psychological Assimilation
- The Ass (in Caricature of Christian Beliefs and Practices)
- Assisi
- Assistant at the Pontifical Throne
