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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, Martin
  25. O'Reilly, Bill
  26. O'Reilly, Bill
  27. O'Sullivan, Ronnie
  28. O'Yeah, Zac
  29. Oakley, Stu
  30. Obomsawin, Diane
  31. Oborne, Martine
  32. Obuhanych, Karen
  33. Odo
  34. Ogilvie, Sara
  35. Ohno, Apolo
  36. Ojari, Daniel
  37. Olav Lahlum, Hans
  38. Oliver, Abi
  39. Oliveros, Chris
  40. Olivotti, Sergio
  41. Olley, Darcie
  42. Ollmann, Joe
  43. Olson, Jennifer Gray
  44. Olson, Parmy
  45. Olusoga, David
  46. Olusoga, Kemi
  47. Olusoga, Yinka
  48. Ondaatje, Michael
  49. Oniki, Yuji
  50. Ono, Yoko
  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