- The Map of Life
- The Soul of Man under Socialism
- Sophist
- An Appeal in Favor of that Class of Americans Called Africans
- Fundamental Principles of the Metaphysic of Morals
- Lessons in Life, for All Who Will Read Them
- Homer and Classical Philology
- How To Behave: A Pocket Manual of Republican Etiquette, and Guide to Correct Personal Habits
- Lysis
- Old-Fashioned Ethics and Common-Sense Metaphysics
- Statesman
- The Ethics of Aristotle
- Seekers after God
- Practical Essays
- Ethics — Part 3
- An Enquiry Concerning the Principles of Taste, and of the Origin of our Ideas of Beauty, etc.
- A Philosophical Dictionary, Volume 10
- Ethics — Part 5
- Auguste Comte and Positivism
- Crito
- Apology, Crito, and Phaedo of Socrates
- The Golden Sayings of Epictetus
- An Enquiry Concerning Human Understanding
- The Friendships of Women
- Probabilities : An aid to Faith
- A Philosophical Dictionary, Volume 4
- The Ethics of Drink and Other Social Questions
- The Ego and His Own
- Protagoras
- Thoughts out of Season Part I
- The Consolation of Philosophy
- Book of Wise Sayings
- Chinese Literature
- Ethics — Part 1
- Ethics — Part 1
- Study of a Woman
- The Memorable Thoughts of Socrates
- How to Marry Well
- Searchlights on Health: Light on Dark Corners
- The Holy war, made by King Shaddai upon Diabolus, for the regaining of the metropolis of the world; ...
- Essays of Schopenhauer
- The Destiny of Man
- A Essay Towards a New Theory of Vision
- Letters to His Son on the Art of Becoming a Man of the World and a Gentleman, 1751
- Utilitarianism
- Poetics. English
- The Unseen World and Other Essays
- On Limitations To The Use Of Some Anthropologic Data
- The System of Nature, Volume 1
- A Treatise Concerning the Principles of Human Knowledge
- The Physical Life of Woman:
- Another Study of Woman
- Categoriae. English
- A Treatise of Human Nature
- Theologico-Political Treatise — Part 4
- Civil Disobedience
- The Critique of Practical Reason
- Politics: A Treatise on Government
- Marie ou l'Esclavage aux Etats-Unis
- Summa Theologica, Part II-II (Secunda Secundae)
- The Mechanism of the Human Voice
- The Prince
- Ethics — Part 2
- Secret Societies
- Notes from the Underground
- Petty Troubles of Married Life, Second Part
- The Republic
- The Young Woman's Guide
- Plato and Platonism
- The Ruins, or, Meditation on the Revolutions of Empires and the Law of Nature
- Siouan Sociology
- Trials and Confessions of a Housekeeper
- Dialogues Concerning Natural Religion
- The Philosophy of the Moral Feelings
- A Lie Never Justifiable
- The Philosophy of Spinoza
- An Essay on the Principle of Population
- The Philosophy of Evolution
- A Philosophical Dictionary, Volume 1
- Essays
- Letters to His Son on the Art of Becoming a Man of the World and a Gentleman, 1753-54
- Ethics — Part 4
- Essays
- The Selections from the Principles of Philosophy
- Myths and myth-makers
- Laws
- Improvement of the Understanding
- Philebus
- The Critique of Pure Reason
- Feuerbach: The roots of the socialist philosophy
- Beyond Good and Evil
- The Existence of God
- Parmenides
- Apology
- Ishmael
- Thus Spake Zarathustra
- The Metaphysical Elements of Ethics
- Our Fathers Have Told Us
- The Dark House
- The Physiology of Marriage, Part 2