- In Defense of Conciliar Christology
- In Defense of Dharma
- In Defense of Dialogue
- In Defense of Elitism
- In Defense of Extended Conciliar Christology
- In Defense of Gun Control
- In Defense of Martin Luther
- In Defense of Moral Luck
- In Defense of Openness
- In Defense of Phenomenology
- In Defense of Polemics
- In Defense of Purity: An Analysis of the Catholic Ideals of Purity and Virginity
- In Defense of Reading
- In Defense of Sentimentality
- In Defense of Things
- In Dialogue with the Greeks
- In Dialogue with the Mahābhārata
- In Exile
- In filosofia con Del Noce
- In Focus Sacred Geometry
- In Foro Conscientiae
- In G-d We Trust: A Handbook of Values for Americans
- In Gods We Trust
- In Good Company
- In Kierkegaard's Garden with the Poppy Blooms
- In libertà
- In Love And War
- In Love With An Idea
- In Love With Logos
- In Madness Lies Sanity
- In Marx's Shadow
- In memoria del Manifesto dei comunisti
- In memorian Alfonso Ibañéz Izquierdo. Razón, verdad y transformación (Xipe totek 109)
- In My Ever After
- In My Humble Opinion
- In nome di chi? Giurisdizione internazionale e teoria del discorso
- In nome di Jaspers
- In Other Shoes
- In Our Best Interest
- In Our Life Time
- In Our Name
- In Our Own Image
- In Plain Sight
- In Praise of Blame
- In Praise of Folly
- In Praise of Folly: Illustrated with Many Curious Cuts
- In Praise of Friendship
- In Praise of Heteronomy
- In Praise of Idleness
- In Praise of Intransigence
- In Praise Of Love
- In Praise of Mathematics
- In Praise of Nothing
- In Praise of Plato's Poetic Imagination
- In Praise of Politics
- In Praise of Prometheus
- In Praise of Reason
- In Praise of Theatre
- In prezenta lui Schopenhauer
- In Principio
- In principio era l'immagine
- In Pursuit of Nanoethics
- In Pursuit of the Good
- In Pursuit: Of Happiness and Good Government
- In quest for the seed idea
- In Quest of History
- In Quest of the Ordinary
- In Response to the Religious Other
- In Russian and French Prisons
- In Schopenhauers Gegenwart
- In Search of a Better World
- In Search Of A Perfect World
- In Search of a Simple Introduction to Communication
- In Search of an Integrative Vision for Technology
- In Search of Andi
- In Search of Authenticity
- In Search of Civilization
- In Search of Clarity
- In Search of Consciousness and the Theory of Everything: Towards the Final Answers to the Mystery of...
- In Search of Divinity: Journey to The Kingdom of Conscience
- In Search of European Liberalisms
- In Search of Goodness
- In Search of Grace
- In Search of Human Nature
- In Search of Humanity
- In Search of Isaiah Berlin
- In Search of Jung (RLE: Jung)
- In Search of Just Families
- In Search of the Common Good
- In Search of the Creator, 4th Edition
- In Search of the Good Life
- In Search of the Heavens
- In Search of the Original Source
- In Search of the Soul
- In Search of the Way
- In Search Of True Virtue
- In Solitude's Grace
- In Statu Nascendi
- In the Absence of Human Beauty
- In The Beggining
- In the Beginning
- In The Beginning
- In the Beginning is Philosophy
- In the Beginning Was the Deed
- In the Beginning, She Was
- In the Buddha's Words
- In the Company of Rilke
- In The Dark Recesses
- In the Dust of This Planet
- In the Event of Laughter
- In the Forest of the Blind
- In the Fourth Year
- In the Fourth Year - Anticipations of a World Peace
- In the Garden Alone
- In the Highest Degree: Volume One
- In the Highest Degree: Volume Two
- In the Image of Origen
- In the Land of the Cyclops
- In the Light of Experience
- In the Marxian Workshops
- In the Middle of Things
- In the Mind of Something Greater
- In the Name of God
- In the Name of Phenomenology
- In the Name of the People
- In the Name of the Rose
- In the Orbit of Love
- In the province of dreams
- In The Quest Of Paradise
- In The Realm of the Senses
- In the Ruins of Neoliberalism
- In the secret heart of the earth
- In the Shadow of Justice
- In the Shadow of Phenomenology
- In the Skin of a Beast