Religious figures
Notable peoplePoliticians and leadersScientists, inventors, and mathematiciansWriters and journalistsReligious figuresRevolutionaries and activistsPhilosophers and social scientistsWritersScientists, inventors and mathematiciansMusicians and composersPhilosophers, historians, political and social scientistsVisual artistsSports figuresMilitary leaders and theoristsRebels, revolutionaries and activistsEntertainersLeaders and politiciansExplorersDirectors, producers and screenwritersBusinesspeopleScientists and inventorsMathematiciansJournalistsArtistsMusiciansCriminalsFilmmakers
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- Ibn AbbasYoungest cousin of the Islamic prophet Muhammad
- Ibn Abi ShaybahIbn Abī Shaybah or Imām Abū Bakr Ibn Abī Shaybah or Abū Bakr ʿAbd Allāh ibn Muḥammad Ibn A
- Ibn AbidinSyrian Hanafi Jurist
- Ibn ArabiSufi scholar and Sunni philosopher (1165–1240)
- Ibn BabawayhShia Islamic scholar (c. 923–991)
- Ibn BashkuwalIbn Bashkuwāl, Khalaf ibn ‘Abd al-Malik ibn Mas'ud ibn Musa ibn Bashkuwāl ibn Yûsuf al-Ans
- Ibn Hajar al-AsqalaniEgyptian Islamic scholar (1372–1449)
- Ibn HazmAndalusian Muslim polymath (994–1064)
- Ibn KathirArab Islamic exegete, historian and scholar (c. 1300–1373)
- Ibn Kathir al-MakkiAbū Maʿbad (or Abū Bakr) ʿAbd Allāh ibn Kathīr al-Dārānī al-Makkī, better known as Ibn Kat
- Ibn Qayyim al-JawziyyaMuslim scholar, jurist, and theologian (1292–1350)
- Ibn TaymiyyaIslamic scholar and jurist (1263–1328)
- Ibn TumartFounder of the Almohad movement (c.1080–c.1128/30)
- IconostasisScreen dividing Eastern Orthodox churches
- Igino Eugenio CardinaleIgino Eugenio Cardinale (14 October 1916 – 24 March 1983) was an Italian prelate of the Ca
- Ignatian spiritualityCatholic religious tradition
- Ignatius of AntiochPatriarch of Antioch from 68 to 107
- Ignatius of LoyolaBasque Spaniard Catholic priest and theologian (1491–1556)
- Imam Ali ShrineMosque and mausoleum of Ali
- Imamate in Twelver doctrineConcept in the largest branch of Shia Islam
- IndulgenceRemission of sins in the Catholic Church
- Innocent of AlaskaRussian bishop and saint (1797–1879)
- Intercession of the TheotokosEastern Orthodox feast, October 1 (October 14 in Julian)
- International Conference of Reformed ChurchesFederation for reformed churches
- International Lutheran CouncilThe International Lutheran Council (ILC) is a worldwide association of confessional Luther
- International New Thought AllianceThe International New Thought Alliance (INTA) is an umbrella organization for New Thought
- Irenaeus2nd-century Greek bishop and Church Father
- Isaac AbarbanelPortuguese Jewish statesman, philosopher, Bible commentator, & financier (1437–1508)
- Isaac K. FunkIsaac Kaufmann Funk (September 10, 1839 – April 4, 1912) was an American Lutheran minister
- Isidore of KievByzantine Greek prelate (1385–1463)
- Isidore of SevilleHispano-Roman scholar (c. 560–636)