- The Metaphysical Elements of Ethics
- Ancient and Modern Celebrated Freethinkers
- The Golden Sayings of Epictetus
- Letters to His Son on the Art of Becoming a Man of the World and a Gentleman, 1753-54
- The Consolation of Philosophy
- The Critique of Pure Reason
- Seekers after God
- An Enquiry Concerning Human Understanding
- The Faith of Our Fathers
- Ethics — Part 3
- The Holy war, made by King Shaddai upon Diabolus, for the regaining of the metropolis of the world; ...
- Statesman
- Old-Fashioned Ethics and Common-Sense Metaphysics
- Apology, Crito, and Phaedo of Socrates
- How To Behave: A Pocket Manual of Republican Etiquette, and Guide to Correct Personal Habits
- The Evolution of Man — Volume 1
- How to Observe
- The Ruins, or, Meditation on the Revolutions of Empires and the Law of Nature
- L'homme Qui Rit
- The Critique of Practical Reason
- Ethics in Service
- The Soul of Man under Socialism
- The Philosophy of Spinoza
- Dialogues Concerning Natural Religion
- Littérature et Philosophie mêlées
- The Ethics of Aristotle
- Notes from the Underground
- Esprit des lois
- Politics: A Treatise on Government
- Ethics — Part 1
- A Man's Value to Society
- On Being Human
- Initiation into Philosophy
- Homer and Classical Philology
- Homer and Classical Philology
- The Destiny of Man
- Book of Wise Sayings
- The Ego and His Own
- The Map of Life
- Levels of Living
- A Essay Towards a New Theory of Vision
- The Unseen World and Other Essays
- The Memorable Thoughts of Socrates
- An Inquiry Into The Nature Of Peace And The Terms Of Its Perpetuation
- Beyond Good and Evil
- The Young Woman's Guide
- The Law and the Word
- The Philosophy of the Moral Feelings
- Ethics — Part 2
- Utilitarianism
- Moral Philosophy
- Laws
- Essays
- The Selections from the Principles of Philosophy
- Improvement of the Understanding
- A Short History of Greek Philosophy
- Essays of Schopenhauer
- When a Man Comes to Himself
- The Will to Believe : and Other Essays in Popular Philosophy
- Thoughts out of Season Part I
- Categoriae. English
- Atheism in Pagan Antiquity
- The Prince
- A Philosophical Dictionary, Volume 4
- Chinese Literature
- The Philosophy of Despair
- Plato and Platonism
- The Basis of Morality
- Civil Disobedience
- The Republic
- Auguste Comte and Positivism
- Walden
- A Philosophical Dictionary, Volume 10
- The Mechanism of the Human Voice
- A Lie Never Justifiable
- Thus Spake Zarathustra
- A System of Logic: Ratiocinative and Inductive
- A Treatise of Human Nature
- Varieties of Religious Experience, a Study in Human Nature
- La rêverie esthétique; essai sur la psychologie du poète
- Liberalism
- Democracy and Social Ethics
- A Treatise Concerning the Principles of Human Knowledge
- Ethics — Part 4
- The Investment of Influence
- Feuerbach: The roots of the socialist philosophy
- Analysis of Mr. Mill's System of Logic
- The Heart of the New Thought
- A Philosophical Dictionary, Volume 1
- A Selection from the Discourses of Epictetus with the Encheiridion
- Fundamental Principles of the Metaphysic of Morals
- Ainsi Parlait Zarathoustra
- The Physiology of Marriage, Part 2
- Apology
- The Philosophy of Evolution
- Poetics. English
- Discours de la méthode
- Essays
- The Existence of God
- Myth and Science