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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, Martin
  19. O'Reilly, Bill
  20. O'Rourke, P. J.
  21. O'Sullivan, Ronnie
  22. O'Sullivan, Suzanne
  23. Oakley, Stu
  24. Oates, Joyce Carol
  25. Obasanjo, Olusegun
  26. Oborne, Martine
  27. Odo
  28. Ogilvie, Sara
  29. Ojari, Daniel
  30. Olav Lahlum, Hans
  31. Oldfield, Matt & Tom
  32. Oliver, Abi
  33. Oliver, Joshua
  34. Olivotti, Sergio
  35. Ollerton, Ollie
  36. Olley, Darcie
  37. Olson, Jessica S.
  38. Olson, Parmy
  39. Olusoga, David
  40. Olusoga, Kemi
  41. Olusoga, Yinka
  42. Ondaatje, Michael
  43. Ono, Yoko
  44. Orczy, Baroness
  45. Ord, Charlotte
  46. Orie, Rima
  47. Orlando, Jade
  48. Ortega, Julio
  49. Orwell, George
  50. Oseid, Kelsey
  51. Osmond, Richard
  52. Ostaseski, Frank
  53. Otis, Andrew
  54. Ounsley, Jodie
  55. Owen, Amanda
  56. Owen, Sid
  57. Owens, Lisa
  58. Oxenbury, Helen
  59. Oxlade, Chris
  60. Oyemakinde, Tomi
  61. Oyeyemi, Helen
  62. Ozawa, Eric
  63. O’Connor, Katherine Tiernan
  64. O’Hart, Sinéad
  65. O’Neill, Eamonn