- A Lie Never Justifiable
- Morals in Trade and Commerce
- The Critique of Practical Reason
- 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
- Initiation into Philosophy
- A Treatise of Human Nature
- Analysis of Mr. Mill's System of Logic
- The Investment of Influence
- Crime: Its Cause and Treatment
- The Republic
- Notes from the Underground
- Probabilities : An aid to Faith
- Youth and Sex
- The Future of the American Negro
- Plato and Platonism
- The Basis of Morality
- The Royal Wedding - Official Souvenir Programme
- The Golden Sayings of Epictetus
- The Positive School of Criminology
- The Critique of Pure Reason
- Criminal Sociology
- Civil Disobedience
- Beyond Good and Evil
- Improvement of the Understanding
- The Young Woman's Guide
- Ethics — Part 3
- Ancient and Modern Celebrated Freethinkers
- Little Essays of Love and Virtue
- Little Essays of Love and Virtue
- The Metaphysical Elements of Ethics
- Seekers after God
- The Law and the Word
- Essays
- Laws
- An Enquiry Concerning Human Understanding
- Apology, Crito, and Phaedo of Socrates
- The Friendships of Women
- When a Man Comes to Himself
- 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
- Apology
- Another Study of Woman
- 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
- Myth and Science
- The Existence of God
- The Story of the Outlaw
- The Ethics of Aristotle
- Feuerbach: The roots of the socialist philosophy
- Ethics — Part 5
- Study of a Woman
- 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
- Lessons in Life, for All Who Will Read Them
- How To Behave: A Pocket Manual of Republican Etiquette, and Guide to Correct Personal Habits
- American Negro Slavery
- A Short History of Greek Philosophy
- What is Property?
- How to Observe
- Chinese Literature
- A Philosophical Dictionary, Volume 4
- Ethics — Part 2
- Phaedrus
- Empire Builders
- The Soul of Man under Socialism
- Secret Societies
- Ethics in Service
- The Philosophy of the Moral Feelings
- A Young Hero
- A Critical Examination of Socialism
- Statesman
- Homer and Classical Philology
- The Map of Life
- Levels of Living
- The Ego and His Own
- Utilitarianism
- The Consolation of Philosophy
- The Memorable Thoughts of Socrates