- Mackintosh, Roger Sherman, 1872-1944 (7)
- Mackler, Allen (1)
- Maclean (1)
- Macomb, John N., 1810 or 1811-1889 (1)
- Macomber & Whyte Ropes Co. (1)
- Macomber, R. Z. (2)
- Macosko, Christopher (University of Minnesota, Twin Cities) (2)
- Macpherson, Alexander (1)
- Macpherson, Charles, active 1773-1790 (1)
- Macris, Nicolas (École Polytechnique Fédérale de Lausanne (EPFL)) (1)
- Macrobius, Ambrosius Aurelius Theodosius (1)
- Macvey, Gordon (1)
- Madan, Dilip (University of Maryland) (1)
- Maday, Yvon Jean (Université de Paris VI (Pierre et Marie Curie)) (3)
- Madigan, David (Columbia University) (5)
- Madsen, Ib (University of Copenhagen) (1)
- Madson, M. G., Seed Co. (3)
- Madson, M. G., Seed Co. (W) (1)
- Madureira Beça, José A. F. de (1)
- Maeder, Suzie E. (2)
