- ✠ St. Ignatius of Antioch, Bishop and Martyr
- ✠ Saint Ignatius of Loyola, Founder of the Society of Jesus
- ✠ Saint Ildephonsus, Bishop of Toledo, Confessor
- ✠ Saint Imelda, Virgin
- ✠ Nov.- Immaculate Conc.
- ✠ Immaculate Conception, of the Blessed Virgin Mary
- ✠ Incarnation of the Word
- ✠ Holy Innocents, Martyrs at the time of the Nativity of Our Lord
- ✠ Saint Irenaeus, Doctor of the Church, Bishop and Martyr
- ✠ Saint Isaac Jogues, North American Martyr
- ✠ Saint Ischyrion, Martyr in Alexandria
- ✠ Saint Isidore, Archbishop and Doctor of the Church
- ✠ St. Isidore of Madrid, Confessor
