- Categoriae. English
- Improvement of the Understanding
- Essays of Schopenhauer
- The Prince
- When a Man Comes to Himself
- The Will to Believe : and Other Essays in Popular Philosophy
- Atheism in Pagan Antiquity
- Myth and Science
- The Young Woman's Guide
- The Philosophy of the Moral Feelings
- The Republic
- Utilitarianism
- Ethics — Part 2
- Civil Disobedience
- The Law and the Word
- Plato and Platonism
- A Treatise of Human Nature
- Moral Philosophy
- Initiation into Philosophy
- Cratylus
- Thoughts out of Season Part I
- The Philosophy of Despair
- The Basis of Morality
- Politics: A Treatise on Government
- Chinese Literature
- The Critique of Practical Reason
- Euthydemus
- Apology
- Auguste Comte and Positivism
- The Existence of God
- Walden
- A Philosophical Dictionary, Volume 10
- Critias
- Ethics — Part 5
- Ethics — Part 5
- The Physiology of Marriage, Part 2
- Thus Spake Zarathustra
- A Lie Never Justifiable
- Democracy and Social Ethics
- The Selections from the Principles of Philosophy
- Phaedo
- Liberalism
- How To Behave: A Pocket Manual of Republican Etiquette, and Guide to Correct Personal Habits
- A Short History of Greek Philosophy
- Essays
- The Investment of Influence
- A Treatise Concerning the Principles of Human Knowledge
- A Philosophical Dictionary, Volume 1
- Beyond Good and Evil
- The Philosophy of Evolution
- Laws
- Essays
- Shorter Prose Pieces
- Poetics. English
- Practical Essays
- Ethics — Part 3
- Apology, Crito, and Phaedo of Socrates
- The Metaphysical Elements of Ethics
- Fundamental Principles of the Metaphysic of Morals
- The Critique of Pure Reason
- An Enquiry Concerning Human Understanding
- Philebus
- The Map of Life
- Letters to His Son on the Art of Becoming a Man of the World and a Gentleman, 1751
- Ancient and Modern Celebrated Freethinkers
- How to Observe
- The Soul of Man under Socialism
- The Heart of the New Thought
- Varieties of Religious Experience, a Study in Human Nature
- Homer and Classical Philology
- Crito
- The Golden Sayings of Epictetus
- The English Utilitarians, Volume I.
- Feuerbach: The roots of the socialist philosophy
- The Evolution of Man — Volume 1
- A Man's Value to Society
- A System of Logic: Ratiocinative and Inductive
- Plutarch's Morals
- On Being Human
- A Essay Towards a New Theory of Vision
- Morals in Trade and Commerce
- The Memorable Thoughts of Socrates
- Summa Theologica, Part II-II (Secunda Secundae)
- The Philosophy of Spinoza
- Book of Wise Sayings
- Dialogues Concerning Natural Religion
- The Destiny of Man
- A Philosophical Dictionary, Volume 4
- Notes from the Underground
- The Ego and His Own
- Levels of Living
- Quotes and Images From The Confessions of J. J. Rousseau
- The Consolation of Philosophy
- Protagoras
- The Unseen World and Other Essays
- Sophist
- Statesman
- Meno
- Ion
- The Ethics of Aristotle