- Searchlights on Health: Light on Dark Corners
- Myths and myth-makers
- A Philosophical Dictionary, Volume 4
- Study of a Woman
- An American Girl Abroad
- Shorter Prose Pieces
- The Destiny of Man
- Chinese Literature
- The Existence of God
- Auguste Comte and Positivism
- The Physiology of Marriage, Part 2
- Walden
- Folk Lore
- Siouan Sociology
- Ethics — Part 2
- The Child at Home
- The Philosophy of the Moral Feelings
- Beyond Good and Evil
- The Selections from the Principles of Philosophy
- The Ethics of Aristotle
- Essays
- How To Behave: A Pocket Manual of Republican Etiquette, and Guide to Correct Personal Habits
- Lessons in Life, for All Who Will Read Them
- Ethics — Part 5
- Ion
- A Philosophical Dictionary, Volume 10
- Statesman
- A Selection from the Discourses of Epictetus with the Encheiridion
- Ethics — Part 4
- Sophist
- Charmides
- The Ethics of Drink and Other Social Questions
- Laws
- Seekers after God
- Seekers after God
- Fundamental Principles of the Metaphysic of Morals
- Another Study of Woman
- Philebus
- The Golden Sayings of Epictetus
- Crito
- The Soul of Man under Socialism
- Our Fathers Have Told Us
- The Metaphysical Elements of Ethics
- Ancient and Modern Celebrated Freethinkers
- Thus Spake Zarathustra
- The Critique of Pure Reason
- Marquise De Ganges
- Improvement of the Understanding
- A Treatise of Human Nature
- Lysis
- Feuerbach: The roots of the socialist philosophy
- Categoriae. English
- Apology
- A Essay Towards a New Theory of Vision
- Politics: A Treatise on Government
- The Critique of Practical Reason
- Ethics — Part 1
- The Ruins, or, Meditation on the Revolutions of Empires and the Law of Nature
- Summa Theologica, Part II-II (Secunda Secundae)
- Petty Troubles of Married Life, Second Part
- A Lie Never Justifiable
- A Philosophical Dictionary, Volume 1
- The Memorable Thoughts of Socrates
- Essays
- The Consolation of Philosophy
- An Enquiry Concerning Human Understanding
- A Treatise Concerning the Principles of Human Knowledge
- The Three Brides
- The Mechanism of the Human Voice
- The Philosophy of Spinoza
- Poetics. English
- The Friendships of Women
- Notes from the Underground
- The Philosophy of Evolution
- Ethics — Part 3
- Meno
- The Prince
- Apology, Crito, and Phaedo of Socrates
- Plato and Platonism
- L'homme Qui Rit
- The Republic
- The Unseen World and Other Essays
- Letters to His Son on the Art of Becoming a Man of the World and a Gentleman, 1751
- Civil Disobedience
- In Praise of Folly
- The Young Woman's Guide
- Secret Societies
- How to Marry Well
- Thoughts out of Season Part I
- Vindication of the Rights of Woman
- Utilitarianism
- The Countess of Saint Geran
- The Ego and His Own
- The Map of Life
- No Compromise with Slavery
- Essays of Schopenhauer
- Homer and Classical Philology
- El Criterio
- Book of Wise Sayings
- Old-Fashioned Ethics and Common-Sense Metaphysics