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- Isaac the Confessor
- Isaac the Great
- Isaac the Recluse
- Isaac the Syrian
- Isabel Hapgood
- Isaiah
- Isaiah (Chronopoulos) of Denver
- Isaiah (Kykkotis) of Tamassos
- Isaias I of Constantinople
- Isaias of Tamassos and Orinis
- Isidor (Nikolsky) of St. Petersburg and Novgorod
- Isidore (Kolokolov) of Mikhailov
- Isidore (Nikolsky) of St. Petersburg
- Isidore II of Constantinople
- Isidore I Buchiras of Constantinople
- Isidore of Chios
- Isidore of Pelusium
- Isidore of Seville
- Isidore of Yuriev
- Isidore the Apostate