- I dwell a captive in His Heart
- I H S
- I.B.V.M.
- I.C.
- I.C.M.
- I.C.R.S.S.
- I.H.M.
- I.M.C.
- I.N.R.I.
- I.W.B.S.
- Ibar, Saint
- Iberius, Saint
- Iberville, Pierre Le Moyne, Sieur d’
- Iceland
- icon
- iconoclasm
- iconography, Christian
- iconostasis
- icthus
- Idaho
- idealism
- idolatry
- Ignatius de Azevedo, Blessed
- Ignatius Loyola, Saint
- Ignatius of Antioch, Saint
- Ignatius of Constantinople, Saint
- Ignaz Philipp Semmelweiss
- Ignazio Persico
- ignorance
- IHS
- il Sodoma
- illegitimacy
- Illinois
- Illinois Indians
- illuminated manuscripts
- Illuminati bavarian
- Illuminati spanish
- illuminative way
- Illuminator, Gregory the
- illustris, Doctor
- Illyrian College
- image of God
- images, veneration of
- imagination
- Imbert, Lawrence Mary Joseph, Blessed
- Imitation of Christ
- Immaculata College
- Immaculate Conception
- Immaculate Conception, Cathedral College of the
- Immaculate Conception, column of
- Immaculate Conception, Feast of the
- Immaculate Conception, scapular of the
- Immaculate Conception Theological Seminary
- Immaculate Heart College
- Immaculate Heart of Mary, scapular of the
- immanence
- immanent action
- Immanuel
- Immense caeli Conditor
- immensity
- immersion
- immortality
- immunity of clergy
- immuration
- immutability
- immutable
- impanation
- impeccability
- impedient impediment
- impediment
- impediment of age
- impediment of Orders
- impediment, diriment
- impediment, hindering
- impediment, impedient
- impenitence
- Imperative, Categorical
- impetration
- impiety
- imposition of hands
- impostors
- impotency
- imprecatory Psalms
- imprimatur
- improperia
- impulse
- impurity
- In Commendam
- In Excelsis
- In Memoriam
- In monte olivia consito
- in partibus infidelium
- in petto
- In Wondrous Mode Set Free, Lo, At The Lord’s Command
- Ina, Saint
- Inca
- incantation
- incardination
- incarnation
- incense
- incense boat
- incest
- Inchbald, Elizabeth
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- Independency
- Independent Order of Odd Fellows
- Index
- Index of Prohibited Books
- Index, Congregation of the
- India
- Indian Sentinel, The
- Indiana
- Indianapolis, Indiana, archdiocese of
- Indians, Babine
- Indians, Cree
- Indians, Hare
- Indians, Illinois
- Indians, Lillooet
- Indians, Loucheux
- Indians, Maya
- Indians, Menominee
- Indians, Moxos
- Indians, Papago
- Indians, Penelakut
- Indians, Pueblo
- Indians, Quamichan
- Indians, Quapaw
- Indians, Sanetch
- Indians, Sechelt
- Indians, Siciatl
- Indians, Songish
- Indians, Spokan
- Indians, Squamish
- Indicopleustes, Cosmas
- indiction
- indifference
- Indifferent Acts
- indifferentism
- indissolubility of marriage
- individual
- individualism
- indulgence, portiuncula
- indulgences
- Indulgences and Relics, Congregation of
- Indulgences, Apostolic
- Indulgences, Day of
- indult
- indwelling of the Holy Ghost
- Ine, Saint
- ineffable
- infallibility
- infamy
- Infant Jesus, apparition of the
- infanticide
- Infessura, Stefano
- infidel
- infidelity
- infinite
- infinity
- influence of the Church on civil law
- infused virtue
- Ingeborg
- Ingolstädt, University of
- Ingres, Jean Auguste Dominique
- Ini, Saint
- injustice
- Inner Life of Mary
- Innocent I, Pope Saint
- Innocent II, Pope
- Innocent III, Pope
- Innocent III, anti-pope
- Innocent IV, Pope
- Innocent V, Pope, Blessed
- Innocent VI, Pope
- Innocent VII, Pope
- Innocent VIII, Pope
- Innocent IX, Pope
- Innocent X, Pope
- Innocent XI, Pope
- Innocent XII, Pope
- Innocent XIII, Pope
- Innocents, Holy
- Innsbruck
- Innuit
- inquisition, canonical
- Inquisition, The
- INRI
- insanity
- Inscription of Abercius
- Inscription of Autun
- inscriptions
- inspiration
- installation
- Institute of Bon Secours (Paris)
- Institute of Bon Secours (Troyes)
- Institute of Brothers of Our Lady of Mercy
- Institute of Charity
- Institute of Mary
- Institute of Mission Helpers
- Institute of Our Lady of Charity of the Refuge
- Institute of Presentation Brothers
- Institute of the Blessed Virgin Mary
- Institute of the Brigidines
- Institute of the Brothers of the Christian Schools
- Institute of the Christian Virgins
- Institute of the Divine Compassion
- Institute of the Holy Family
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- institution
- Instructions of the Apostles
- instruments of martyrdom
- instruments of the Passion
- integrity
- intention
- intention for the sacraments
- intention, purity of
- intercession
- interdict
- interest, legal
- interims
- International Catholic Truth Society
- International Holiness Church
- International Order of Odd Fellows
- internuncio
- interpretation of dreams
- intinctio panis
- intolerance
- intransigeance
- Introduction to the Devout Life
- introduction, Biblical
- introit
- intrusion
- Inventor Rutili Dux Bone Luminis
- inventory of church property
- investiture
- Invicte Martyr, unicum
- invitatory
- inward grace
- Iona
- Iona, Ronan of, Saint
- Ionic order
- Iowa
- Iowa Synod
- Ira justa Conditoris
- Iran
- Iraq
- Ireland
- Ireland, Catholic University of
- Ireland, Clement of, Saint
- Ireland, John
- Irenaeus, Saint
- Irene, Sister
- Iringa, Tanzania, diocese of
- Irish College of Lisbon
- Irish College of Louvain
- Irish College, Rome
- Irish Colleges on the Continent
- Irish Ecclesiastical Record
- Irish Emigrant Society
- Irish hedge-schools
- Irish Martyrs
- Irish Sisters of Charity
- Iron Crown of Lombardy
- irregularity
- irremovability
- Irvingites
- Isaac
- Isaac Barrow
- lsaac Casaubon
- Isaac Hecker
- Isaac Henderson
- Isaac Jogues, Blessed
- Isaac Newton
- Isabel, Saint
- Isabella I
- Isabella the Catholic
- Isaiah
- Isaias
- Iscariot, Judas
- Ishmael
- Isidore of Seville, Saint
- Isidore the Laborer, Saint
- Isidorian Rite
- Isla de Los Apostolos
- Islam
- Islamabad-Rawalpindi, Pakistan, diocese of
- Islands, Philippine
- Isle of the Apostles
- Islip, Simon
- Ismael
- Ismaelites
- Israel
- Israel, kingdom of
- Israelites
- Israelites, captivities of the
- Issachar
- Istanbul, Turkey, vicariate apostolic
- Iste Confessor Domini collentes
- Iste quem laeti colimus
- Italo-Greeks
- Itanagar, India, diocese of
- Italy
- Ite Missa Est
- itineraria
- itinerary
- Ives, Saint
- Ives, Levi Silliman
- Ivo, Saint
- Ivo of Chartres, Saint
- Ivor, Saint
- ivory
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