D
- Dacca
- Dagon
- Dahomey
- Dallas
- Dalmatia
- Dalmatic
- Damao
- Damaraland
- Damascus
- Damietta
- Dan
- Danaba
- Dance of Death
- Dancing
- Daniel
- Daniel Ammen
- Daniel Bonifacius von Haneberg
- Daniel Carroll
- Daniel Comboni
- Daniel Fitter
- Daniel Greysolon, Sieur du Lhut
- Daniel Murray
- Daniel Noble
- Daniel O'Connell
- Daniel O'Daly
- Daniel of Winchester
- Daniel Rock
- Daniel William Cahill
- Daniele Da Volterra
- Daniele Farlati
- Daniello Bartoli
- Daniello Concina
- Dansara
- Dante Alighieri
- Darco Antonio de Dominis
- Dardanus
- Darnis
- Dates and Dating
- Daughters of Jesus
- Daughters of Providence
- Daughters of the Cross
- Daughters of the Cross
- Daughters of the Divine Redeemer
- Daughters of the Holy Cross
- Daughters of Wisdom
- Daulia
- Davenport
- David Augustine Baker
- David Beaton
- David Moriarty
- David O'Bruadair
- David of Augsburg
- David of Dinant
- David Paul Drach
- David Rothe
- David Scotus
- David Teniers
- David William Bacon
- David-Augustine de Brueys
- Davila Padilla
- Dax
- Day of Atonement (Yom Kippur)
- De Jussieu
- De Paul University
- De Profundis
- Deaconesses
- Deacons
- Dead Sea
- Dean
- Debbora
- Debt
- Decalogue
- Decapolis
- Decimus Magnus Ausonius
- Decius
- Decree
- Dedication
- Deduction
- Defender of the Matrimonial Tie
- Definitor (In Canon Law)
- Definitors (In Religious Orders)
- Degradation
- Dei Gratia; Dei Et Apostolicae Sedis Gratia
- Deism
- Deity
- Delatores
- Delaware
- Delaware Indians
- Delcus
- Delegation
- Delilah
- Deluge
- Demetrius
- Demetrius Augustine Gallitzin
- Demiurge
- Demoniacs
- Demonic Possession
- Demonology
- Demons
- Denes
- Denis Amelote
- Denis Auguste Affre
- Denis de Frayssinous
- Denis Jamay
- Denis Lambin
- Denis Mary Bradley
- Denis Petau
- Denis-Benjamin Viger
- Denis-Nicolas Le Nourry
- Denmark
- Dennis Florence MacCarthy
- Denunciation
- Denver, Colorado
- Denys
- Deo Gratias
- Deposition
- Derbe
- Dermond O'Hurley
- Derogation
- Derry (Deria)
- Desecration
- Desert (In the Bible)
- Desertion
- Desiderio Da Settignano
- Desiderius Erasmus
- Desire Raoul Rochette
- Despair
- Desservants
- Determinism
- Detraction
- Detroit, Michigan
- Deus in Adjutorium Meum Intende
- Deuteronomy
- Devil
- Devil Worship
- Devises and Bequests For Masses (United States)
- Devolution
- Devotion to the Blessed Virgin Mary
- Devotion To the Heart of Mary
- Devotion to the Sacred Heart of Jesus
- Devotional Medals
- Dhuoda
- Diaconicum
- Diakovar
- Dialectic
- Diamantina
- Diano
- Diario Romano
- Diaspora
- Dibon
- Dicuil
- Didacus Ximenes
- Didascalia Apostolorum
- Didot
- Didymus the Blind
- Diego Alvarez
- Diego Alvarez Chanca
- Diego Andrada de Payva
- Diego Carranza
- Diego Collado
- Diego Covarruvias
- Diego de Almagro
- Diego Deza
- Diego Fernandez de Palencia
- Diego Francisco Aduarte
- Diego Francisco Altamirano
- Diego Hurtade de Mendoza
- Diego Lopez de Cogolludo
- Diego Munoz Camargo
- Diego Rodriguez de Silva y Velazquez
- Diego Ruiz de Montoya
- Diego Ximenez de Enciso
- Diemoth
- Dies Irae
- Diether of Isenburg
- Dietrich Gresemund
- Dietrich von Nieheim
- Digne
- Dijon
- Dimissorial Letters
- Diocaesarea
- Diocesan Chancery
- Diocesan Consultors
- Diocese
- Dioceses (Supplemental List)
- Dioceses of Valva and Sulmona
- Dioclea
- Diocletian
- Diocletianopolis
- Diodorus of Tarsus
- Dionigi Da Palacenza Carli
- Dionysias
- Dionysius
- Dionysius Calvaert
- Dionysius Exiguus
- Dionysius of Alexandria
- Dionysius the Pseudo-Areopagite
- Dioscorus
- Dioscurus
- Diptych
- Discalced
- Discernment of Spirits
- Disciple
- Disciples of Christ
- Discipline of the Secret
- Disparity of Worship
- Dispensation
- Dispersion of the Apostles
- Distinguished Jesuits
- Distraction
- Distributions
- Dithmar
- Dives
- Divination
- Divine Attributes
- Divine Judgment
- Divine Office
- Divine Promise (In Scripture)
- Divine Providence
- Divorce (in Civil Jurisprudence)
- Divorce (In Moral Theology)
- Docetae
- Docimium
- Doctor
- Doctors of the Church
- Doctrine of Addai
- Doctrine of the Atonement
- Dogma
- Dogmatic Fact
- Dogmatic Theology
- Doliche
- Dolores Mission
- Dolphin
- Dom Augustin Calmet
- Dom Francois Armand Gervaise
- Dom Jacques Alexandre
- Dome
- Domenichino (Domenico Zampieri)
- Domenico Bernini
- Domenico Campagnola
- Domenico Capranica
- Domenico Feti
- Domenico Fontana
- Domenico Palmieri
- Domenico Passignano
- Domenico Passionei
- Domenico Viva
- Domesday Book
- Domicile
- Domingo (San Anton y Munon) Chimalpain
- Domingo Banez
- Domingo de Salazar
- Domingo Fernandez Navarrete
- Domingos Caldas-Barbosa
- Dominic Gravina
- Dominic of Prussia
- Dominic of the Mother of God
- Dominic Schram
- Dominic Soto
- Dominic Vallarsi
- Dominical Letter
- Dominique Bouhours
- Dominique Parrenin
- Dominique-Jean Larrey
- Dominus Vobiscum
- Domitian
- Domitiopolis
- Domnus Apostolicus
- Don Isaac Abrabanel
- Donatello di Betto Bardi
- Donation (In Canon Law)
- Donation (In Civil Jurisprudence)
- Donation of Constantine
- Donatists
- Donato Bramante
- Donatus of Fiesole
- Donogh Mor O'Daly
- Dora
- Dorylaeum
- Dositheans
- Douai
- Douay Bible
- Double Altar
- Double Monasteries
- Doubt
- Dove
- Dower
- Down and Connor
- Downside Abbey
- Doxology
- Drachma
- Dresden
- Droit de Regale
- Dromore
- Druidism
- Drusilla
- Drusipara
- Druzes
- Dryburgh Abbey
- Du Coudray
- Dualism
- Dublin
- Dubuque
- Duc de Saint-Simon
- Duccio di Buoninsegna
- Duchess of Aiguillon
- Duel
- Dulia
- Duluth
- Dunedin
- Dungal
- Dunkeld
- Dupanloup
- Durand Ursin
- Durandus of Saint-Pourcain
- Durandus of Troarn
- Durango (Mexico)
- Durazzo (Albania)
- Durham (Dunelmum)
- Durham Rite
- Duties of Relatives
- Duty
- Duvergier de Hauranne
- Dynamism
- St. Darerca
- St. David
- St. Deicolus
- St. Demetrius
- St. Denis
- St. Desiderius of Cahors
- St. Deusdedit
- St. Diarmaid
- St. Dichu
- St. Didacus
- St. Dinooth
- St. Disibod
- St. Dominic
- St. Donnan
- St. Dorothea
- St. Drostan
- St. Dubric
- St. Dunchadh
- St. Dunstan
- St. Dymphna
- The Defect of Birth (Illegitimacy)
- The Didache
- The Dominican Republic
- The Drevet Family
- The Duke of Alva
- The Duke of La Rochefoucauld-Liancourt