Geographic Abbreviations and Acronyms
- OCHOffice of the Chief Hydrologist
- OCLObject Constraint Language
- OCLCOhio College Library Center
- OCTSOcean Color and Temperature Scanner
- OCULOntario Council of University Libraries
- OCXObject Component Extension
- ODBCOperational Database Connectivity
- ODCOpen Data Consortium
- ODEOpen Development Environment
- ODFOregon Department of Forestry
- ODFWOregon Department of Fish and Wildlife
- ODGMIOregon State Department of Minerals and Mineral Industries
- ODGSOhio Division of Geological Survey
- ODNROhio Department of Natural Resources
- ODOPOhio Digital Orthophotography Project
- OEEPEOrganisation Europeene D'Etudes En Photogrammetrie Experimentale
- OESAOffice of Earth Science Applications
- OFOpen File
- OFATOntario Flow Assessment Techniques
- OFFNOffnung
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