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  1. O'Brien, Lucy
  2. O'Brien, Sean
  3. O'Byrne, Nicola
  4. O'Byrne, Nicola
  5. O'Connell, Joanne
  6. O'Connor, Bridget
  7. O'Connor, Deborah
  8. O'Connor, Elizabeth
  9. O'Donnell, Bridget
  10. O'Dowd, Chris
  11. O'Hara, Lauren
  12. O'Hara, Mo
  13. O'Hara, Natalia
  14. O'Hare, Gráinne
  15. O'Kane, Owen
  16. O'Neill, A.D.
  17. O'Neill, Amanda
  18. O'Neill, Heather Aimee
  19. O'Neill, Martin
  20. O'Reilly, Bill
  21. O'Rourke, P. J.
  22. O'Shaughnessy, Patrick
  23. O'Sullivan, Ronnie
  24. Oakley, Phil
  25. Oakley, Stu
  26. Oates, Joyce Carol
  27. Obasanjo, Olusegun
  28. Oborne, Martine
  29. Odette, Tessonja
  30. Odo
  31. Ogden, Emily
  32. Ogilvie, Sara
  33. Ojari, Daniel
  34. Olav Lahlum, Hans
  35. Oldfield, Matt & Tom
  36. Oldfield, Richard
  37. Oliver, Abi
  38. Oliver, Joshua
  39. Olivotti, Sergio
  40. Ollerton, Ollie
  41. Olley, Darcie
  42. Olsen, Chris
  43. Olson, Jessica S.
  44. Olson, Parmy
  45. Olusoga, David
  46. Olusoga, Kemi
  47. Olusoga, Yinka
  48. Ondaatje, Michael
  49. Orczy, Baroness
  50. Ord, Charlotte
  51. Orie, Rima
  52. Orlando, Jade
  53. Orsenna, Érik
  54. Ortega, Julio
  55. Orwell, George
  56. Osborne, George
  57. Oseid, Kelsey
  58. Osman, Jim
  59. Osmond, Richard
  60. Ostaseski, Frank
  61. Ounsley, Jodie
  62. Owen, Amanda
  63. Owen, Sid
  64. Owens, Lisa
  65. Oxlade, Chris
  66. Oyemakinde, Tomi
  67. Oyeyemi, Helen
  68. Ozawa, Eric
  69. O’Connor, Katherine Tiernan
  70. O’Hart, Sinéad
  71. O’Neill, Eamonn