Name
- Marr, John Edward, geologist1
- Marschall, August Friedrich, Count1
- Martelli, Ugolino, of the Botanical Garden, Florence1
- Martin, Francis Pitney Brouncker, Wadham College, Oxford; MA 18431
- Maskelyne, Mervyn Herbert Nevil Story-, minerologist, politician and photographer, 1823-19111
- Masters, Maxwell Tylden, FRS, botanist1
- McClintock, Francis Leopold, Admiral KCB1
- McCormick, Robert, naval surgeon1
- McIntosh, William Carmichael, zoologist1
- McMahon, Charles Alexander, Major-General1
- Meldola, Raphael, of the Technical College, Finsbury1
- Melvill, James Cosmo, botanist1
- Merian, Peter, Swiss geologist1
- Meyer, Adolf Bernhard, German anthropologist1
- Miers, Henry Alexander, mineralogist1
- Miers, John, botanist1
- Miller, Alexander, Superintendent of the Zoological Gardens1
- Milne, John, seismologist1
- Milne-Edwards, Alphonse, French naturalist1
- Minchin, Edward Alfred1