- O Pioneers!
- O planeta confuso
- O príncipe, com prefácio de Paulo Vieira
- O que é o Brasil?
- O Reino das Mulheres
- O sumiço da elefanta
- Ocell blanc
- OCR A Level Law Second Edition
- OCR A-level Sociology Student Guide 1: Socialisation, culture and identity with Family and Youth sub...
- OCR A-level Sociology Student Guide 2: Researching and understanding social inequalities
- OCR A-level Sociology Student Guide 3: Debates in contemporary society: Globalisation and the digita...
- OCR AS/A Level Law Book 1
- OCR GCSE (9-1) Psychology
- OCR GCSE (9–1) Citizenship Studies
- OCR Psychology for A Level Book 1
- OCR Psychology for A Level Book 2
- OCR Sociology for A Level Book 1
- OCR Sociology for A Level Book 2
- Odd One Out
- Odliv Na Ostrove Osích Hniezd
- Off the Map
- Old Hickory:Andrew Jackson and the American People
- Old Man of the Woods
- Oma braucht uns - Das Kindersachbuch zum Thema Altwerden, häusliche Pflege und Generationen-Wohnen
- Oman
- Once and for All
- Once Upon A Time
- One Hen
- One Person, No Vote (YA edition)
- One Thousand Paper Cranes
- Opening My Eyes Underwater
- Orations
- Oroonoko
- Our Constitution Rocks
- Our Dogs, Ourselves -- Young Readers Edition
- Our Stories, Our Voices
- Our World in Pictures: Countries, Cultures, People & Places
- Outlaw
- Overwhelmed: The Self-care Guide for College Students