I

Ida of Herzfeld, Saint

Ida of Toggenburg, Saint

Ignatius Delgado and Dominic Henares, Saints and Companions

Ignatius of Antioch, Saint

Ignatius of Loyola, Saint

Ildefonsus, Saint

Imelda Lambertini, Blessed

Inácio de Azevedo, Blessed and Companions

Innocent I, Saint

Innocent V, Saint

Innocents, Holy

Invention of the True Cross

Ippolito Galantini, Blessed

Irenaeus, Saint

Irenaeus of Sirmium, Saint

Irene of Tomar, Saint

Isaac of Dalmatia, Saint

Isaac Jogues, Saint

Isabel I of Castille, Servant of God and Catholic Monarch

Isaiah the Prophet, Saint

Ischyrion, Saint

Isidore the Farmer, Saint

Isidore of Pelusium, Saint

Isidore of Scetis, Saint

Isidore of Seville, Saint

Ivo of Kermartin, Saint