| Office of the City Clerk |
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| Ohio |
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| Ohio Genealogical Society |
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| Ohio History Connection |
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| OhioLINK |
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| OhioNET |
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| Ohio State University |
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| Ohio State University Knowlton School of Architecture |
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| Ohio State University Libraries |
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| Ohio University |
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| Ohio University Libraries |
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| Ohio Wesleyan University |
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| OHSU |
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| 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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