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  1. O'Brien, Jack
  2. O'Brien, Sean
  3. O'Byrne, Nicola
  4. O'Byrne, Nicola
  5. O'Callaghan, Jonathan
  6. O'Connell, Joanne
  7. O'Connor, Barbara
  8. O'Connor, Bridget
  9. O'Connor, Elizabeth
  10. O'Connor, George
  11. O'Connor, Kevin E.
  12. O'Dell, Emily Jane
  13. O'Dowd, Chris
  14. O'Hara, Lauren
  15. O'Hara, Mo
  16. O'Hara, Mo
  17. O'Hara, Natalia
  18. O'Hare, Gráinne
  19. O'Kane, Owen
  20. O'Meara, Tim
  21. O'Neil, Scott
  22. O'Neill, Amanda
  23. O'Neill, Heather Aimee
  24. O'Neill, Lisa
  25. O'Neill, Martin
  26. O'Reilly, Bill
  27. O'Reilly, Bill
  28. O'Sullivan, Ronnie
  29. O'Yeah, Zac
  30. Oakley, Stu
  31. Obomsawin, Diane
  32. Oborne, Martine
  33. Obuhanych, Karen
  34. Odo
  35. Ogilvie, Sara
  36. Ohno, Apolo
  37. Ojari, Daniel
  38. Olav Lahlum, Hans
  39. Oliver, Abi
  40. Oliveros, Chris
  41. Olivotti, Sergio
  42. Olley, Darcie
  43. Ollmann, Joe
  44. Olson, Jennifer Gray
  45. Olson, Parmy
  46. Olusoga, David
  47. Olusoga, Kemi
  48. Olusoga, Yinka
  49. Ondaatje, Michael
  50. Oniki, Yuji
  51. Onyebuchi, Tochi
  52. Orchard, Eric
  53. Orczy, Baroness
  54. Ord, Charlotte
  55. Ordóñez, Miguel
  56. Orlando, Jade
  57. Orloff, Judith
  58. Orr, Kristen
  59. Orr, Wendy
  60. Ortega, Claribel A.
  61. Orwell, George
  62. Orwell, George
  63. Oshiro, Mark
  64. Osho
  65. Osho
  66. Osmond, Richard
  67. Ostaseski, Frank
  68. Ostertag, Molly Knox
  69. Ostow, Micol
  70. Otoshi, Kathryn
  71. Ottaviani, Jim
  72. Oubrerie, Clément
  73. Oubrerie, Marguerite Abouet & Clément
  74. Ounsley, Jodie
  75. Overdeck, Laura
  76. Owen, Amanda
  77. Owen, Margaret
  78. Owen, Sid
  79. Owens, Lisa
  80. Oxlade, Chris
  81. Oyemakinde, Tomi
  82. Oyeyemi, Helen
  83. Oyin
  84. O’Connor, Katherine Tiernan
  85. O’Neill, Eamonn