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. Joanne O'Connell
  9. Des O'Connor
  10. Bridget O'Donnell
  11. Kim O'donnell
  12. Chris O'Dowd
  13. Sheila O'Flanagan
  14. Andrew O'Hagan
  15. Mo O'Hara
  16. Kate O'Hearn
  17. Owen O'Kane
  18. A. O'kif
  19. Shaquille O'Neal
  20. Amanda O'Neill
  21. Martin O'Neill
  22. Bill O'Reilly
  23. P J O'Rourke
  24. P. O'rourke
  25. Ellie O'Ryan
  26. Ellie O'Shea
  27. Feargus O'Sullivan
  28. Kate O'Sullivan
  29. Kate O'Sullivan
  30. Ronnie O'Sullivan
  31. O'toole
  32. O'toole O'toole
  33. P. O'toole
  34. Peter O'Toole
  35. Nicky O’Byrne
  36. Katherine Tiernan O’Connor
  37. Dermot O’Leary
  38. Olusegun Obasanjo
  39. Obie Oberholzer
  40. Martine Oborne
  41. Jenny Offill
  42. Jenny Offill
  43. Sara Ogilvie
  44. Sara Ogilvie
  45. Jean Davies Okimoto
  46. Ella Okstad
  47. Hans Olav Lahlum
  48. Jenny Oldfield
  49. Matt Oldfield
  50. Molly Oldfield
  51. Andrew Oldham
  52. Abi Oliver
  53. Mark Oliver
  54. Ramon Olivera
  55. Edith Olivier
  56. Peter Olney
  57. David Olusoga
  58. J. Ondaatje
  59. M. Ondaatje
  60. Michael Ondaatje
  61. Michael Oppenheim
  62. Hiawyn Oram
  63. Baroness Orczy
  64. Miguel Ordonez
  65. David Orme
  66. David and Helen Orme
  67. Cheryl Orsini
  68. Julio Ortega
  69. Davide Ortu
  70. Jack Osbourne
  71. Kelsey Oseid
  72. Alice Oseman
  73. Osho
  74. Richard Osmond
  75. Frank Ostaseski
  76. Matt Ottley
  77. Wil Overton
  78. Amanda Owen
  79. Lisa Owens
  80. H. Oxbury
  81. Chris Oxlade
  82. Chris Oxlade
  83. Paul Oyer
  84. Helen Oyeyemi
  85. R. Ozeki