- The Young Woman's Guide
- Beyond Good and Evil
- Utilitarianism
- The Child at Home
- Siouan Sociology
- Ethics — Part 2
- Essays
- The Philosophy of the Moral Feelings
- Civil Disobedience
- Improvement of the Understanding
- Categoriae. English
- Essays of Schopenhauer
- Thoughts out of Season Part I
- The Prince
- Book of Wise Sayings
- Cratylus
- The Physiology of Marriage, Part 2
- Shorter Prose Pieces
- The Destiny of Man
- Essays Æsthetical
- Poetics. English
- Ethics — Part 4
- An American Girl Abroad
- The Selections from the Principles of Philosophy
- Laws
- Quotes and Images From The Confessions of J. J. Rousseau
- How to Marry Well
- Slavery Ordained of God
- Another Study of Woman
- The Three Brides
- The Existence of God
- Searchlights on Health: Light on Dark Corners
- The Unseen World and Other Essays
- The Physical Life of Woman:
- The Physical Life of Woman:
- Ethics — Part 5
- Auguste Comte and Positivism
- The Memorable Thoughts of Socrates
- A Lie Never Justifiable
- The Commonwealth of Oceana
- Euthydemus
- Kritik der reinen Vernunft
- The Mechanism of the Human Voice
- How To Behave: A Pocket Manual of Republican Etiquette, and Guide to Correct Personal Habits
- No Compromise with Slavery
- Old-Fashioned Ethics and Common-Sense Metaphysics
- Plato and Platonism
- The Republic
- Chinese Literature
- Study of a Woman
- Politics: A Treatise on Government
- Secret Societies
- The Critique of Practical Reason
- The System of Nature, Volume 2
- The System of Nature, Volume 1
- Ancient and Modern Celebrated Freethinkers
- Crito
- Manners, Customs, and Dress During the Middle Ages and During the Renaissance Period
- Meno
- The Metaphysical Elements of Ethics
- An Enquiry Concerning Human Understanding
- Philebus
- Practical Essays
- Seekers after God
- Ethics — Part 3
- The Praise of Folly
- The Critique of Pure Reason
- Apology, Crito, and Phaedo of Socrates
- Fundamental Principles of the Metaphysic of Morals
- A Selection from the Discourses of Epictetus with the Encheiridion
- A Philosophical Dictionary, Volume 1
- Statesman
- Sophist
- The Map of Life
- Ion
- The Ego and His Own
- A Essay Towards a New Theory of Vision
- Ethics — Part 1
- In Praise of Folly
- Social Rights and Duties, Volume I (of 2)
- Apology
- The Consolation of Philosophy
- Timaeus
- Essays
- Walden
- Feuerbach: The roots of the socialist philosophy
- A Domestic Problem : Work and Culture in the Household
- Gorgias
- The Ethics of Aristotle
- The Philosophy of Spinoza
- Dialogues Concerning Natural Religion
- A Treatise of Human Nature
- Notes from the Underground
- Thus Spake Zarathustra
- Lessons in Life, for All Who Will Read Them
- Laches
- A Philosophical Dictionary, Volume 4
- Myths and myth-makers
- Charmides
- Summa Theologica, Part II-II (Secunda Secundae)