[Animal Faith '67]
Animal Faith and Spiritual Life (John Lachs, ed., Appleton-Century-Crofts, New York, New York 1967).
[Background '44]
George Santayana, The Background of My Life (volume I of Persons and Places) (Charles Scribner's Sons, New York 1944).
[Birth of Reason '68]
The Birth of Reason & Other Essays by George Santayana (Daniel Cory, ed., Columbia University Press, New York, New York 1968).
[Character & Opinion '20]
George Santayana, Character and Opinion in the United States (Charles Scribner's Sons, New York 1920).
[Christ '46]
George Santayana, The Idea of Christ in the Gospels or God in Man: A Critical Essay (Charles Scribner's Sons, New York, New York 1946).
[Common Sense '24]
George Santayana, The Life of Reason or The Phases of Human Progress: Reason in Common Sense (2nd ed., Charles Scribner's Sons, New York, New York 1924).
[Dialogues '48]
George Santayana, Dialogues in Limbo (Charles Scribner's sons, New York, New York 1948 by Daniel M. Cory, with three new dialogues) (first published, 1926).
[Dominations '72]
George Santayana, Dominations and Powers (Augustus M. Kelley Publishers, Clifton, New Jersey 1951, re-issued 1972).
[Egotism '40]
George Santayana, Egotism in German Philosophy (J.M. Dent & Sons Limited, New York: Charles Scribner's Sons 1916, New Editions 1940).
[Genteel Tradition at Bay '31]
George Santayana, The Genteel Tradition at Bay (New York: Charles Scribner's Sons 1931).
[Letters '55]
The Letters of George Santayana (Daniel Cory, ed.; Charles Scribner's Sons, New York, New York 1955).
[Letters '01 to '07]
The Letters of George Santayana, Books 1 to 7, [1868]-1952 (William G. Holzberger & Herman J. Saatkamp Jr., eds.; MIT Press, 2001- ) (constituting volume 5 of The Works of George Santayana)
[My Host '53]
George Santayana, My Host the World (volume III of Persons & Places) (Charles Scribner's Sons, New York 1953).
[On America '68]
Santayana on America: Essays, Notes, and Letters on American Life, Literature, and Philosophy (Richard Coulton Lyon, ed.; Harcourt, Brace & World, Inc., New York 1968).
[Phil. of G.S. '51]
Paul Arthur Schilpp, ed., The Philosophy of George Santayana (Library Living Philosophers, volume II, 2nd ed., Open Court, La Salle, Illinois 1951).
[Physical Order '69]
Physical Order and Moral Liberty: Previously Unpublished Essays of George Santayana (John and Shirley Lachs, eds.; Vanderbilt University Press, Nashville, TN 1969).
[Platonism '27]
Platonism and the Spiritual Life (Charles Scribner's Sons, New York 1927; printed in Great Britain, Chiswick Press)
[Poetry & Religion '00]
George Santayana, Interpretations of Poetry and Religion (Charles Scribner's Sons, New York, New York 1900).
[Poets '10]
George Santayana, Three Philosophical Poets: Lucretius, Dante, and Goethe (Harvard University Press 1910).
[Realms '72]
George Santayana, Realms of Being (one-volume edition, Cooper Square Publishers, Inc., New York, New York 1972).
[Religion '26]
George Santayana, The Life of Reason or The Phases of Human Progress: Reason in Religion (2nd ed., Charles Scribner's Sons, New York, New York 1926).
[Santayana '63]
Daniel Cory, Santayana: The Later Years: A Portrait with Letters (George Braziller, New York, New York 1963)
[Scepticism '55]
George Santayana, Scepticism and Animal Faith: Introduction to a System of Philosophy (Dover Publications, Inc., New York, New York 1955 (unabridged and unaltered republication of the work first published in 1923)).
[Science '25]
George Santayana, The Life of Reason or The Phases of Human Progress: Reason in Science (2nd ed.[?], Charles Scribner's Sons, New York, New York 1925).
[Soliliquies '22]
George Santayana, Soliliquies in England and Later Soliliquies (Charles Scribner's Sons, New York, New York 1922).