| Oklahoma City Community College |
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| Oklahoma State University Library |
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| Oklahoma State University–Stillwater |
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| Old Dominion University |
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| Omeka |
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| OmniTech |
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| OMNITEC Solutions |
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| Onondaga County Public Library |
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| Ontario |
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| Ontario College of Art & Design |
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| Ontario Colleges Library Service |
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| Ontario Colleges Library Service (OCLS) |
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| Ontario Council of University Libraries |
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| Ontario Tech University Library |
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| Open Environmental Data Project |
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| Open-i Advisors |
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| Open Knowledge Foundation |
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| Open Knowledge Foundation, Dryad |
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| Open Library Environment |
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| Open Planets Foundation |
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| Open Preservation Foundation |
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| Open Society Archives |
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| Open Syllabus Project |
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| Open University |
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| Optometrists Association Australia |
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