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