- O Cerrado para Educadores(as)
- O Pensamento geográfico brasileiro - Vol 1
- Oases and Globalization
- Object-Oriented Cartography
- Ocean Tides and Tsunamis - Nature Book for Kids Children's Nature Books
- Oceans for Kids: People, Places and Cultures - Children Explore the World Books
- Oceans: A Very Short Introduction
- Of Ancient Mountains and Seas Volume 2: Western Highlands 山海经卷二:西山经
- Off Grid Life
- Offermosen
- Offshore
- Oil
- Oléron
- Omphalos
- On Shifting Foundations
- On the Margins of Urban South Korea
- On the Natural History of the Aru Islands
- On the Zoological Geography of the Malay Archipelago
- On Time and Water
- Ondergronds
- One Hundred Proofs that the Earth is Not a Globe
- Online Maps with APIs and WebServices
- Online Urbanization
- Onze jours à Rome
- Open Cities Open Data
- Open Source Geospatial Science for Urban Studies
- Opening and Closure of the Neuquén Basin in the Southern Andes
- OpenStreetMap in GIScience
- Operatic Geographies
- Oplevelser i ukendt land
- Operatic Geographies
- Oplevelser i ukendt land
- Ordenación del territorio: análisis y diagnóstico
- Organisation muséologique au Cambodge
- Organising Post-Disaster Reconstruction Processes
- Organized Crime and the Nation-State
- Orient et Italie
- Other Geographies
- Out Here
- Out of the Woods
- Outcomes of post-2000 Fast Track Land Reform in Zimbabwe
- Outdoor Recreation
- Outskirts
- Over-Exploitation of Forests