(A few of the books listed below I no longer care for, but all held some significance for me at points in my life, and many still do.)
Fiction/Poetry
One Hundred Years of Solitude–Gabriel Garcia Marquez
Moby-Dick–Herman Melville
Leaves of Grass–Walt Whitman
Collected Fictions–Jorge Luis Borges
The Aeneid–Virgil
The Wanderer–Alain-Fournier
Odyssey–Homer
Ulysses–James Joyce
The Adventures of Augie March–Saul Bellow
Collected Works–William Blake
Divine Comedy–Dante Alighieri
Infinite Jest–David Foster Wallace
The Magic Mountain–Thomas Mann
The End of the Affair–Graham Greene
The Baron in the Trees–Italo Calvino
The Natural–Bernard Malamud
The Marriage Plot–Jeffrey Eugenides
Herzog–Saul Bellow
The Great Gatsby–F. Scott Fitzgerald
Portnoy’s Complaint–Philip Roth
Sir Gawain and the Green Knight–Unknown
Don Quixote–Miguel Cervantes
The History of Tom Jones–Henry Fielding
The Golden Ass–Apuleius
Pale Fire–Vladimir Nabokov
The Blind Assassin–Margaret Atwood
Never Let Me Go–Kazuo Ishiguro
The Neapolitan Novels–Elana Ferrante
A Little Larger Than the Entire Universe–Fernando Pessoa
Lolita–Vladimir Nabokov
A Heart So White–Javier Marias
Martin Dressler–Steven Millhauser
Arturo’s Island–Elsa Morante
Non-Fiction
Ethics–Spinoza
Meditations–Marcus Aurelius
A History of Western Philosophy–Bertrand Russell
The World as Will and Representation–Arthur Schopenhauer
Memories, Dreams, Reflections–Carl Jung
Man’s Search for Meaning–Viktor Frankl
The Republic–Plato
The Will to Believe–William James
The Portable Jung–Carl Jung
The Golden Bough–James George Frazer
The Art of Fiction–John Gardner
The Varieties of Religious Experience–William James
Baha’u’llah and the New Era—J.E. Esslemont
A History of Philosophy–Frederick Copleston
The Imitation of Christ–Thomas Kempis
The Passion of the Western Mind–Richard Tarnas
The Enneads–Plotinus
The Teachings of Don Juan–Carlos Castaneda
Stride Toward Freedom–Martin Luther King, Jr.
Passage Meditation–Eknath Easwaran
The Seven Habits of Highly Effective People–Stephen Covey
Reality Hunger–David Shields
The Life of Samuel Johnson–James Boswell
The Histories–Herodotus
Empathy and the Novel–Suzanne Keen
Selected Non-Fictions–Jorge Luis Borges