1. McCarty, Maclyn 1, 2
2. McClintock, Barbara 1
3. MacDiarmid, Hugh (Christopher Murray Grieve) 1
4. MacDonald, George 1
5. Mackenzie, J.U. 1
6. McLaren, Angus 1
7. MacLeod, Colin 1, 2
8. Macleod, Fiona (pseudonym of William Sharp) 1
9. Maeterlinck, Maurice 1
10. Malthus, Thomas 1, 2, 3
11. Mandelbrot, Benoit 1, 2
12. Mann, Thomas 1
13. Manning, Mrs 1
14. Mansfield, Katherine 1
15. Manson, Sir Patrick 1, 2
16. Martini, Francesco di Giorgio 1
17. Marvell, Andrew 1
18. Marx, Jenny 1
19. Masefield, John 1
20. Mason, Miss (PNEU founder) 1
21. Matthews, Drum 1, 2
22. Maximilian, Emperor 1
23. Maxwell, James Clerk 1, 2, 3, 4, 5
25. May, Robert 1
26. Mayr, Ernst 1
27. Medawar, Sir Peter 1, 2, 3, 4
28. Medici, Grand Duke, Cosimi II de’ 1
29. Meitner, Lise 1, 2
30. Meloney, Mrs William 1
31. Mendel, Gregor Johann 1, 2, 3
32. Mendeléeff (Mendeleyev), Dmitri Ivanovitch 1, 2
33. Mensinga, W.P.J. 1
34. Meyer, Lothar 1
35. Miall, Louis Compton 1
36. Miller, Hugh 1
37. Millet, Captain (of ocean diving team) 1
38. Milton, John 1, 2, 3
39. Mirsky, Alfred 1
40. Mitford, Captain B.E. (‘Mitty’) 1
41. Moissan, Henri 1
42. Montagu, Henry, Earl of Manchester 1
43. Montagu, Lady Mary Wortley 1
44. Monticelli, Marquis of 1
45. Moore, B.R. 1
46. Moore, Henry 1
47. Moore, Johnny 1, 2
48. Moreau, Gustave 1
49. Morrell, Lady Ottoline 1
50. Morse, Samuel F.B. 1
51. Mosely, Henry 1
52. Moynihan, Berkeley George 1
53. Mozart, Wolfgang Amadeus 1
54. Mucius 1
55. Muir, Pattison 1
56. Müller, Hugo 1
57. Muybridge, Eadward 1