- A Lie Never Justifiable
- The Critique of Practical Reason
- Morals in Trade and Commerce
- 论语
- On Being Human
- A Essay Towards a New Theory of Vision
- Dialogues Concerning Natural Religion
- The Philosophy of Spinoza
- Politics: A Treatise on Government
- Ethics — Part 1
- Thus Spake Zarathustra
- A Treatise of Human Nature
- Analysis of Mr. Mill's System of Logic
- The Investment of Influence
- A Treatise Concerning the Principles of Human Knowledge
- The Republic
- Notes from the Underground
- Probabilities : An aid to Faith
- Plato and Platonism
- The Basis of Morality
- The Golden Sayings of Epictetus
- The Critique of Pure Reason
- Civil Disobedience
- Beyond Good and Evil
- Improvement of the Understanding
- The Young Woman's Guide
- Ethics — Part 3
- Ancient and Modern Celebrated Freethinkers
- The Metaphysical Elements of Ethics
- Seekers after God
- The Law and the Word
- Essays
- Laws
- An Enquiry Concerning Human Understanding
- An Enquiry Concerning Human Understanding
- Apology, Crito, and Phaedo of Socrates
- When a Man Comes to Himself
- The Will to Believe : and Other Essays in Popular Philosophy
- Categoriae. English
- The Faith of Our Fathers
- The Prince
- A Selection from the Discourses of Epictetus with the Encheiridion
- Atheism in Pagan Antiquity
- The Philosophy of Evolution
- The Physiology of Marriage, Part 2
- Fundamental Principles of the Metaphysic of Morals
- Democracy and Social Ethics
- Poetics. English
- The Selections from the Principles of Philosophy
- Discours de la méthode
- Shorter Prose Pieces
- Apology
- The Theological Tractates and The Consolation of Philosophy
- Essays
- Letters to His Son on the Art of Becoming a Man of the World and a Gentleman, 1753-54
- A Philosophical Dictionary, Volume 1
- Walden
- Myth and Science
- The Existence of God
- The Ethics of Aristotle
- Feuerbach: The roots of the socialist philosophy
- A Philosophical Dictionary, Volume 10
- Ethics — Part 5
- A Man's Value to Society
- Liberalism
- The Destiny of Man
- Arrows of Freethought
- Ethics — Part 4
- Book of Wise Sayings
- The Heart of the New Thought
- How To Behave: A Pocket Manual of Republican Etiquette, and Guide to Correct Personal Habits
- Menexenus
- A Short History of Greek Philosophy
- How to Observe
- Chinese Literature
- A Philosophical Dictionary, Volume 4
- Ethics — Part 2
- Phaedrus
- The Soul of Man under Socialism
- Auguste Comte and Positivism
- Essays of Schopenhauer
- Ethics in Service
- The Philosophy of the Moral Feelings
- Moral Philosophy
- Old-Fashioned Ethics and Common-Sense Metaphysics
- Statesman
- The Holy war, made by King Shaddai upon Diabolus, for the regaining of the metropolis of the world; ...
- Thoughts out of Season Part I
- Homer and Classical Philology
- Protagoras
- The Map of Life
- Letters to His Son on the Art of Becoming a Man of the World and a Gentleman, 1751
- Sophist
- The Unseen World and Other Essays
- Levels of Living
- The Ego and His Own
- Utilitarianism
- The Consolation of Philosophy
- An Inquiry Into The Nature Of Peace And The Terms Of Its Perpetuation
- On Compromise