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| Dall Restoration Society Inc | Cleveland |
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| Dalton Community Historical Society | Dalton |
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| Damascus Area Historical Society of Ohio | Damascus |
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| Darke County Chapter-OGS | Greenville |
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| Darke County Historical Society | Greenville |
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| Daughters of the American Revolution-Ohio Society | Lima |
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| Dawes Arboretum | Newark |
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| Dawes Memorial Library | Marietta |
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| Dayton History | Dayton |
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| Dayton History at the Archive Center | Dayton |
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