| Maryland Historical Society |
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| Maryland Institute College of Art |
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| Marymount University |
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| Maryville University |
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| Massachsetts Historial Society |
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| Massachusetts Board of Library Commissioners |
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| Massachusetts College of Art and Design |
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| Massachusetts Institute of Technology |
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| Massachusetts Institute of Technology Libraries |
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| Massachusetts Library Network Cooperative (MassLNC) |
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| Massachusetts Maritime Academy |
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| Massachusetts Medical Society |
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| Mathematica |
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| Max Planck Institute for the History of Science |
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| McConnell Library, Radford University |
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| McDaniel College |
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| McDonald's |
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| McGill University |
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| McGill University Library |
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| McGill University Library and Archives |
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| McGill University Library & Archives |
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| McGovern Historical Center |
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| McLaughlin Research Corporation |
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| McMaster University |
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| MD Anderson Cancer Center |
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