- O Comedor de Pregos e Outras Histórias
- Obama: An Intimate Portrait
- Ocean Devil
- Octavia, Daughter of God
- Odd Boy Out
- Odette
- Of Fortunes and War
- Official and Confidential: The Secret Life of J Edgar Hoover
- Oh ... Oberlin
- Old Man Goya
- Old World Hero Stories - Volume I - Ancient Hero Stories
- Olga's Story
- Oliver Cromwell (Penguin Monarchs)
- Olympe de Gouges
- On Patriotism
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