Books Listed by Title
- O Pioneers! / Willa Cather
- The Oath / Hippocrates ; translated by Francis Adams
- Obscure Destinies / Willa Cather
- Observations on the Effects of the Corn Laws, and of a Rise or Fall in the Price of Corn on the Agriculture and General Wealth of the Country / Thomas Malthus
- The Ocean wave / Ambrose Bierce
- Odd John : a story between jest and earnest / Olaf Stapledon
- The Odd Women / George Gissing
- The Odour of Chrysanthemums / D. H. Lawrence
- Introduction to 'The Celibates' by Honoré de Balzac / George Saintsbury
- The Odyssey of Homer : done into English prose / by S.H. Butcher and Andrew Lang
- The Odyssey of Homer / translated by Alexander Pope ; with an introduction by the Rev. Theodore Alois Buckley
- The Odyssey / rendered into English prose by Samuel Butler
- Oeconomicus. English
- The Oedipus Trilogy of Sophocles / translated by F. Storr
- Of Captain Misson and his crew / Daniel Defoe
- Of Suicide / David Hume
- Of The Epidemics / Hippocrates ; translated by Francis Adams
- Of the friendship of Amis and Amile : [done out of the ancient French into English / by William Morris].
- Of the Geometrical Spirit / Blaise Pascal ; translated by O.W. Wright
- Of the Nature of Things / Titus Lucretius Carus ; a metrical translation by William Ellery Leonard
- Of Time and the River : a legend of Man’s hunger in his youth / Thomas Wolfe
- Off on a Comet / Jules Verne
- Olaf Liljekrans / Henrik Ibsen
- Olalla / Robert Louis Stevenson
- Old Cookery Books and Ancient Cuisine / William Carew Hazlitt
- The Old Curiosity Shop / Charles Dickens
- Old Fires and Profitable Ghosts : a book of stories / Arthur Thomas Quiller-Couch [1900]
- Old French Romances / William Morris
- The Old Maid / Edith Wharton
- An Old Maid / Honoré de Balzac ; translated by Katharine Prescott Wormeley
- Old Mortality / Sir Walter Scott
- The Old Nurse's Story / Elizabeth Gaskell
- The Old Pacific Capital / Robert Louis Stevenson
- The Old Stone House and other stories / Anna Katharine Green
- The Old Wives' Tale / Arnold Bennett
- Old World Romances / Edgar Allan Poe
- The Olive Fairy Book / Andrew Lang.
- Oliver Twist ; or the Parish boy's progress / Charles Dickens
- On a Piece of Chalk / Thomas Henry Huxley
- On airs, waters, and places / Hippocrates ; translated by Francis Adams
- On Ancient Medicine / Hippocrates ; translated by Francis Adams
- On Benefits / L. Annaeus Seneca
- On Dreams / Aristotle; translated by J. I. Beare
- On Fistulae / Hippocrates ; translated by Francis Adams
- On Forsyte 'Change / John Galsworthy
- On Fractures / Hippocrates ; translated by Francis Adams
- On Generation and Corruption / Aristotle; translated by H. H. Joachim
- On Hell / Robert Green Ingersoll
- On Hemorrhoids / Hippocrates ; translated by Francis Adams
- On Heroes and Hero Worship and the Heroic in History / Thomas Carlyle
- On Horsemanship / Xenophon ; translated by H. G. Dakyns
- On Human Nature / Arthur Schopenhauer; translated by T. Bailey Saunders
- On Hunting : A Sportsman's Manual / Xenophon ; translated by H. G. Dakyns
- On hunting. English
- On Injuries of the Head / Hippocrates ; translated by Francis Adams
- On Interpretation / Aristotle; translated by E. M. Edghill
- On Liberty / John Stuart Mill
- On Longevity and Shortness of Life / Aristotle; translated by G. R. T. Ross
- On Memory and Reminiscence / Aristotle; translated by J. I. Beare
- On our knowledge of the causes of the phenomena of organic nature Six Lectures to Working Men, at the Museum of Practical Geology, 1863. / T.H. Huxley
- On Our Selection / Steele Rudd
- On Prophesying by Dreams / Aristotle; translated by J. I. Beare
- On Regimen in Acute Diseases / Hippocrates ; translated by Francis Adams
- On Sense and the Sensible / Aristotle; translated by J. I. Beare
- On Skulls / Robert Green Ingersoll
- On Sleep and Sleeplessness / Aristotle; translated by J. I. Beare
- On Sophistical Refutations / Aristotle; translated by W. A. Pickard-Cambridge
- On the Advisableness of Improving Natural Knowledge / Thomas Henry Huxley
- On the Antiseptic Principle of the Practice of Surgery / Joseph Lister
- On The Articulations / Hippocrates ; translated by Francis Adams
- On the Conduct of the Allies / Jonathan Swift
- On the Conduct of the Allies / Jonathan Swift
- On the Duty of Civil Disobedience / Henry David Thoreau
- On the Eve / Ivan Turgenev; translated from the Russian by Constance Garnett, with an introduction by Edward Garnett
- On the extension of the germ theory to the etiology of certain common diseases / Louis Pasteur ; translated by H. C. Ernst
- On the fabric of the human body in seven books. Latin. [1555]
- On the Gait of Animals / Aristotle; translated by A. S. L. Farquharson
- On the Generation of Animals / Aristotle; translated by Arthur Platt
- On the Heavens / Aristotle; translated by J. L. Stocks
- On the Improvement of the Understanding / Benedict de Spinoza; translated by R. H. M. Elwes
- On the law which has regulated the introduction of new species / Alfred Russel Wallace
- On the Motion of Animals / Aristotle; translated by A. S. L. Farquharson
- On the Motion of the Heart and Blood in Animals / William Harvey
- On the Natural Faculties / Galen ; translated by Arthur John Brock
- On the origin of species
- On the Parts of Animals / Aristotle; translated by William Ogle
- On the Sacred Disease / Hippocrates ; translated by Francis Adams
- On the Soul / Aristotle; translated by J. A. Smith
- On the Study of Zoology / Thomas Henry Huxley
- On the Sublime and Beautiful / Edmund Burke
- On the Sublime / Longinus ; translated by W. Rhys Roberts
- On the Surgery / Hippocrates ; translated by Francis Adams
- On the tendency of varieties to depart indefinitely from the original type / Alfred Russel Wallace
- On Ulcers / Hippocrates ; translated by Francis Adams
- On Vaccination / Edward Jenner
- “On with the dance!” / Ambrose Bierce
- On Youth and Old Age, On Life and Death, On Breathing / Aristotle; translated by G. R. T. Ross
- One of Ours / Willa Cather
- One Remained Behind: a romance a la mode Gothique / Marjorie Bowen
- The Orange Fairy Book / Andrew Lang
- Oration on the Dignity of Man / Giovanni Pico della Mirandola
- The Ordeal of Richard Feverel: A History of a Father and Son / George Meredith ; with an introduction by Frank W. Chandler
- Orestes / Euripides; translated by E. P. Coleridge
- The Origin of Species / Charles Darwin
- Orlando Furioso / Lodovico Ariosto; translated by William Stewart Rose
- Orlando Innamorato / translated into prose from the Italian of Francesco Berni and interspersed with extracts in the same stanza as the original by William Stewart Rose
- Orlando / Virginia Woolf
- Ormond / Maria Edgeworth
- Oroonoko ; or, The Royal Slave / Aphra Behn
- Oscar Wilde, his life and confessions / Frank Harris
- Othello, the Moore of Venice / William Shakespeare
- The Other Gods / H.P. Lovecraft
- The Other House / Henry James
- Our Mr. Wrenn / Sinclair Lewis
- Our Mutual Friend / Charles Dickens
- Our Revolution / Leon Trotsky
- Our Street / William Makepeace Thackeray
- Out of the Earth / Arthur Machen
- An Outcast of the Islands / Joseph Conrad
- The Outcry / Henry James
- The Outgoing of the Tide / John Buchan
- The Outsider / H.P. Lovecraft
- Over the River / John Galsworthy
- Ovid's Metamorphoses / translated into English verse under the direction of Sir Samuel Garth by John Dryden, Alexander Pope, Joseph Addison, William Congreve and other eminent hands

