1. A
  2. B
  3. C
  4. D
  5. E
  6. F
  7. G
  8. H
  9. I
  10. J
  11. K
  12. L
  13. M
  14. N
  15. O
  16. P
  17. Q
  18. R
  19. S
  20. T
  21. U
  22. V
  23. W
  24. X
  25. Y
  26. Z
  1. Clare O' Donoghue
  2. Terrie O'Brian
  3. Claire O'Brien
  4. Kiera O'Brien
  5. Kiera O'Brien
  6. Sean O'Brien
  7. Nicola O'Byrne
  8. Jonathan O'Callaghan
  9. Joanne O'Connell
  10. Des O'Connor
  11. Bridget O'Donnell
  12. Kim O'donnell
  13. Chris O'Dowd
  14. Sheila O'Flanagan
  15. Andrew O'Hagan
  16. Mo O'Hara
  17. Kate O'Hearn
  18. Owen O'Kane
  19. A. O'kif
  20. Shaquille O'Neal
  21. Amanda O'Neill
  22. Martin O'Neill
  23. Bill O'Reilly
  24. P J O'Rourke
  25. P. O'rourke
  26. Ellie O'Ryan
  27. Ellie O'Shea
  28. Feargus O'Sullivan
  29. Kate O'Sullivan
  30. Kate O'Sullivan
  31. Ronnie O'Sullivan
  32. O'toole
  33. O'toole O'toole
  34. P. O'toole
  35. Peter O'Toole
  36. Nicky O’Byrne
  37. Katherine Tiernan O’Connor
  38. Dermot O’Leary
  39. Olusegun Obasanjo
  40. Obie Oberholzer
  41. Martine Oborne
  42. Jenny Offill
  43. Jenny Offill
  44. Sara Ogilvie
  45. Sara Ogilvie
  46. Jean Davies Okimoto
  47. Ella Okstad
  48. Hans Olav Lahlum
  49. Jenny Oldfield
  50. Matt Oldfield
  51. Molly Oldfield
  52. Andrew Oldham
  53. Abi Oliver
  54. Mark Oliver
  55. Ramon Olivera
  56. Edith Olivier
  57. Sergio Olivotti
  58. Peter Olney
  59. David Olusoga
  60. J. Ondaatje
  61. M. Ondaatje
  62. Michael Ondaatje
  63. Yoko Ono
  64. Michael Oppenheim
  65. Hiawyn Oram
  66. Baroness Orczy
  67. Miguel Ordonez
  68. David Orme
  69. David and Helen Orme
  70. Cheryl Orsini
  71. Julio Ortega
  72. Davide Ortu
  73. Jack Osbourne
  74. Kelsey Oseid
  75. Alice Oseman
  76. Osho
  77. Richard Osmond
  78. Frank Ostaseski
  79. Matt Ottley
  80. Wil Overton
  81. Amanda Owen
  82. Lisa Owens
  83. H. Oxbury
  84. Chris Oxlade
  85. Chris Oxlade
  86. Paul Oyer
  87. Helen Oyeyemi
  88. R. Ozeki