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  1. O'Brian, Terrie
  2. O'Brien, Gerry
  3. O'Brien, Sean
  4. O'Byrne, Nicola
  5. O'Byrne, Nicola
  6. O'Callaghan, Jonathan
  7. O'Connell, Joanne
  8. O'Connor, Bridget
  9. O'Connor, Des
  10. O'Connor, Elizabeth
  11. O'Donnell, Bridget
  12. O'Dowd, Chris
  13. O'Furniture, Patty
  14. O'Hara, Lauren
  15. O'Hara, Mo
  16. O'Hara, Natalia
  17. O'Hare, Gráinne
  18. O'Kane, Owen
  19. O'Malley, Rory
  20. O'Neill, Amanda
  21. O'Neill, Heather Aimee
  22. O'Neill, Martin
  23. O'Reilly, Bill
  24. O'Rourke, P. J.
  25. O'Shaughnessy, Patrick
  26. O'Sullivan, Feargus
  27. O'Sullivan, Heather
  28. O'Sullivan, Ronnie
  29. O'Sullivan, Suzanne
  30. O'Toole, Peter
  31. O'Yeah , Zac
  32. Oakley, Phil
  33. Oakley, Stu
  34. Obama, Michelle
  35. Obiora, Michael
  36. Oborne, Martine
  37. Ochlan, PJ
  38. Ochman, Joe
  39. Ochota, Mary-Ann
  40. Odo
  41. Ogilvie, Sara
  42. Ojari, Daniel
  43. Ojo, Adenrele
  44. Okello, Kate
  45. Okoye, Nneka
  46. Okuboyejo, Sandra
  47. Olav Lahlum, Hans
  48. Oldbury, Stephen
  49. Oldfield, Richard
  50. Oldham, Andrew
  51. Oliver, Abi
  52. Oliver, Jana
  53. Olivotti, Sergio
  54. Olley, Darcie
  55. Olson, Parmy
  56. Olukoya, Dami
  57. Olusoga, David
  58. Olusoga, Kemi
  59. Olusoga, Yinka
  60. Onayemi, Prentice
  61. Ondaatje, Michael
  62. Ono, Yoko
  63. Onwukwe, Ben
  64. Orczy, Baroness
  65. Ord, Charlotte
  66. Orlando, Jade
  67. Orsini, Kate
  68. Ortega, Julio
  69. Orwell, George
  70. Osborne, George
  71. Osbourne, Jack
  72. Oseid, Kelsey
  73. Osman, Jim
  74. Osmond, Nicholas
  75. Osmond, Richard
  76. Osorio, Lee
  77. Ostaseski, Frank
  78. Ounsley, Jodie
  79. Ovens, Sarah
  80. Owen, Amanda
  81. Owen, Sid
  82. Owens, Lisa
  83. Owusu, Jude
  84. Oxlade, Chris
  85. Oyemakinde, Tomi
  86. Oyer, Paul
  87. Oyeyemi, Helen
  88. Ozolins, Janis
  89. O’Connor, Katherine Tiernan
  90. O’Neill, Eamonn